alright.. im in the begining stages of a 400 build and im just still questioning which way to go?? im not doing anything wild just the good old 800-900 dollar rotating assys. block is a two bolt 509 casting. going on top will be the top end that is on my 283 currently.. * GM Performance vortec heads, 1.5 roller rockers, *upgrading to screw in studs and possibly a bit of pocket porting if feeling greedy. and a performer rpm manifold. just curious on which way to go .. 377 or 406?? going in a truck 3800+ lbs, 700r4 trans and 4.10 gears with a 28'' tall tire