I agree

I would do a 5.7 stroker which would work out to a392" motor

I would go with the eagle head for $

The 6.1 stuff is more expensive. the 5.7's can be found comeplete motors for a few hundred bucks.

With bobs K frame you could even keep the truck oil pan.

A 392" eagle headed motor could make 600hp easy with all stock stuff except for the stroker kit and lil head porting.