I was assuming these engines were in a 30 sonic. Being a 45 excalibur, my guess is you wont be running 6000rpm across the water. In that case, your cam, and mpi intake , might be a good choice for what you have there

or do what it says on the cam card.

I am going to respectfully disagree with this statement. In the couple of dealings that I have had with Bob, although he is seemingly very knowledgeable, his parts that he is peddling are less than desirable. I am talking specifically about junk Morel liters that you cannot preload and camshafts that are ground incorrectly possibly due to the hand written cards. And by the time that you pay shipping on every part that is dropped shipped from somewhere else, you will have about twice the money in it as you should. Sorry, Bob. Not a hater, we just can't do business any more.

Junk morel lifters? Care to explain?

Jamie I'm not going to broad stroke here and say they are junk I'm sure there are many that are working fine.
Not sure I'll ever know why, but I do have the remains of a PBM lifter scattered throughout one of my engines.
Saw a comment on a web site that said around 60 hrs they had problems with the .842 lifters, maybe Internet talk? But at around 80 I've got a mess to clean up.
According to what I've been able to dig up Callies makes Morel, PBM, Cam Motion, Lunati and others, same lifter just different brand names.

I personally don't have enough confidence to put them back in after refresh and will be taking them out of other motor too.

I hear ya, I'd question those as well. I was going off of snapmorgans comment. I've had crane, lunati and a few others all come apart. I have about 10 sets of morels out there I setup and installed with no issue yet, hoping not for 300+ hours. How was your valve train geometry? What pushrods were used?

Ive had good luck with my 4603 morels so far. A buddy of mine, had tie bar failure on his . A couple other setups friends of mine built had issues with them collapsing.

Im going to be tearing into mine soon and see how things are looking.

I believe morel makes the lifters for pbm, howards, lunati, cam motion, possibly crower ?

I did have an issue with a collapsed lifter early on, not sure if it was due to the lifter, or something else. Only one lifter was bad. So i was able to order 1 pair of lifters from lunati. They are the same as the 4603 morel, i wanna say the part number was 72431 ...id have to check my lunati catalog when i get home.

Nothing to do with geometry. Bad from the get go. To be more specific, I have had 2 sets of hydraulic roller lifters that about half of them would not adjust. The plunger would not depress. They acted like solids. Both sets were replaced, but had 2 collapse on a very mild setup. .625 lift 150/450# deal after very low hours. Not interested in ever using them again. The stock GM ones have worked perfectly in both of these aps where the Morel's didn't. I am not sure of the exact part# of the ones I tried, but they were sent with the cams from Bob. Oh yeah, and the cam that was ground wrong cost me an engine from reversion in about 2 hrs run time. Has since been corrected and running strong, but not with those parts.

The roller tips are right in the middle of the valve stem, the rocker was still tight in the lifter that came apart. I don't know the brand of push rods and haven't measured them but they are pretty stout looking and tapered. Looks like Crane pushrods,guide plates and gold rockers
You'll have to forgive some of my bbc ignorance. I've been playing with 440's and Hemis for a long time! I'm trying to learn as much as I can about BBC as quickly as I can....I've come over to the dark side LOL

From what I've bern able to find Callies makes Morel and many others same products different brand names....kinda like Air conditioning 7 mfg 88 brands