I chose Ferrea Super Alloy P/N F2120P, if you are a vet the Ferrea company will give you a 40% discount.

Are Ferrea Super Alloy > or = to manley Inconel?

Read their webpage, these are the best exhaust valves they make, better than Inconel, from one of the best valve co, IMHO.

Newest potential issue: pulley alignment. I have a CP performance crankshaft pulley

This one.
http://i880.photobucket.com/albums/a...r/13850_4_.jpg
http://i880.photobucket.com/albums/a...r/13850_1_.jpg

I see that mine is much different than the one that comes on most 454 mags and 525sc. Will the 525sc lower blower pulley mate up? And if not, are all lower 3v pulleys interchangeable?

Ok progress began today. I yanked the motor out today. There is no way that my oil cooler is big enough for even 420hp. The oil cooler portion is only 3 inches long. I think my lines are large enough except right by the filter. Tear down will begin tomorrow.

Here are some photos of my oil system.

http://i880.photobucket.com/albums/a...r/IMG_2249.jpg
http://i880.photobucket.com/albums/a...r/IMG_2251.jpg
http://i880.photobucket.com/albums/a...r/IMG_2252.jpg
http://i880.photobucket.com/albums/a...r/IMG_2250.jpg

back to original question, yes the DUI dist will clear, here's pic of one of my old setups, suggest locking the advance and running 32-34 timing

http://i227.photobucket.com/albums/d...r/100_3409.jpg

A little update: The motor is down to the shortblock. The shortblock appears to be in good shape and will be used as-is. The head are another story. Cylinders 1,3,5,7 all had sunk in valves with 3,5 being sunk in at least 1/8th inch. The heads are at the machine shop right now being gone through. I have new oil cooler on the way. I also hope to be installing a hp500 thermostatic oil filter boss. Thats about it for now.

Update: I pulled the shortblock apart. I had a bad feeling. Upon tear down i found the following.:

#4 rod bearing was pretty beat on the upper half. The others were not horrible. The corresponding piston looks like all the others.

#1 main bearing had a big groove in the lower.

http://i880.photobucket.com/albums/a...36209810_n.jpg
http://i880.photobucket.com/albums/a...58237239_n.jpg
http://i880.photobucket.com/albums/a...18736978_n.jpg
http://i880.photobucket.com/albums/a...46411369_n.jpg

Like was mentioned on your FB posting... that sucks! Sorry for the unfortunate news. Good thing you pulled it all apart. Fixing is easy. How bad is the crank?

What caused the valves to sink? Were they tulipped?

Valves did not appear to be tulipped. I dont know for sure what caused it. My machinist suspects they went slightly lean.