Thats funny. What is your build

.

Here you go.

To answer your question why from a bit ago, its all about combination, the parts working well together, sometimes you throw stuff together with stuff laying around and runs better than it should...been lucky there myself, but many times goes the other way, your heads/cam/intake would work great @9.5, at this point the cam is letting what little compression you have right out the back door and the intake likes RPM and @ 5k that is not cutting it...

Here's an effective solution to the carb dilemma. I saw these pulled off an Eliminator that was converting to Whipples earlier this year at Young Performance Marine. Give Eddie a call and see if he still has them. I'm sure he can help you setup the proper timing/tuning. I know he'll even fly to you if a water tune is necessary. He rebuilt a carbed roots blower motor for us and it's tits.

10:1 496's, AFR 305 V2 heads, 454R intake with a 4500 flange, holley 1050's, crane 741's.

Theres a couple vids in the members online video section

Yes, too big.
An 850 would be a good choice.

Ran boat yesterday after changing pertronix modules. And adding 2 degrees timing. Total 36. Max rpm weekend before 5100 with 34 timing. Max rpm yesterday 4500?wtf. Also changed breakin oil before we went out. Broke it in with t4 rotella 15-40w with crane additive. Last weekend hot temps wot 65 and 20 idle. This weekend 65 wot and 5psi idle. Oil temp gauge is at remote filter before cooler. Temps ar wot are 240-250. Bearing clearance set at .0030 1-4 .0035 5. Rods .0029. Did i fry the oil or do i need a straight weight 40 or 50. Also we had extra 1000 pounds in boat this weekend. Not sure how much that would affect rpm

A lot! Need to be comparing apples to apples when making changes looking for improvement.

What oil do you have in it now?

5 psi I'd be removing the filter and cutting it open looking for things. Hope not, but ....

If motor is okay, check oil psi with mechanical gauge.