Need to build a 489" BB to produce 550HP, but, it must make enough vacuum to run my PB, Cruise, AC, and all the other "creature comforts" I like.

I'm thinking 10-1 compression with a hydraulic cam in the neighborhood of 236 @ .050 with .556 lift. I'll run an Edelbrock Performer RPM with an 850 Holley.

Headers with a 2 1/2" mandrel bent exhaust.

It will be backed up by a T-400 with a 3000 convertor (remember I put street miles on this thing) and a 3:70 Posi rear.

I'm hauling 4500 Lbs and I could use some cylinder head ideas.