Comp XE268 - O/T, Brand X!

I had a couple Pontiac's when I was in my early 20's and the 400 is a real stump puller. If I was building what you described I'd go with the 268xe cam too. The factory 350 hp heads are decent flowing heads as cast but a good performance valve job by somebody that knows Pontiac heads would be a real good addition. You definetly want to keep the rev's under 5500 cause Pontiac's had junk rods. They were cast and used 3/8" bolts. Either have them resized using ARP bolts or replace them with good aftermarket rods and have the reciprocating assy. balanced.

With an Air-Gap intake, 750 vac. sec Holley, and set of good headers it should approach 400hp. If you do plan on using headers make sure and get ones that have separate middle tubes. The cheaper headers made for Pontiac's D-port head combined the middle tubes into one larger tube and the flow was pretty unbalanced. When I got my Poncho the headers were real rusty and needed to be replaced. I replaced them with a set of divorced port tube Hookers and it made a big diff on how it ran.