Right now I'm just in the feasibility/parts collecting stage of the project. While I really want to build the engine as a Poly initially, chances are after I'm thru playing with that it's final configuration will be as a HEMI.

I'm aware that common belief is that switching to HEMI heads on a Poly will drop the compression by at least a point and that valve clearance reliefs are in different locations. Piston selection will be critical and possibly even require a piston change from one to the other.

I know that a lot of the initial figuring can be done on paper and researching the few sources I've come across. For me the real test will come when I actually have the parts in my hands and can do real world measurements and testing. It ought to be interesting...so far I haven't found any real show stoppers but you never know.