I could use some advice. I'm trying to build a 496 or maybe a 489 stroker(so i could use the block again) and I recently found some 781 cylinder heads which I have heard are one of the best flowing large oval port heads. Do you think they will be big enough to support this big of an engine? I'm not really concerned with horsepower. I want to achieve around 550 lb-ft if I can so I figure HP will fall maybe in the 400 to 450 range with a fairly low RPM band. Also, what work should I have done on the heads? They have 119CC open combustion chambers I believe so would it be helpful to have the heads milled and the deck height reduced so I can get a decent CR? I know i'm asking alot of questions but here is one final one, if I build the above engine, is it gonna eat my TH400? I am trying to tailor the truck for trail and crawling duty. Thanks in advance.