quote:The Summit engine is a big block Ford (= more weight & less room), the PIM Hammer is a stroked Windsor block.
BOTH will need a lot of new parts to fit in a Pantera.
Mounts...headers...water hoses/pipes...etc.
Big block will require relocating the a/c condenser due to its length.
On the other hand, 500 HP is pretty easy from your Cleveland, and if you turbo it, your 600HP is a piece of cake.
Larry