engine experiment...take a shot.

[Captkaos]

Depending on the bottom end (I believe the 260hp motor only had 8.6:1 CR) you are not going to see 400hp on that motor, as most top end kits require a decent bottom end to make their predicted power as bd pointed out and with the listed cam setup you are going to need a good size stall.  You need to plan the build around the end result you are hoping to achieve.

[BIG CHEVY]

Sorry guys for the uninformation. This is ending up in a camaro with a Borg Warner 4 speed. I can change Pistons. Just don't wanna change rods and crank.

[1980c10]

Your rods and crank will work fine. (If you were asking)