I have a 68 Dart two door that I'm playing with what I cant decide is whether I want to convert the slant six that's in it now to EFI and strap a turbo on it, or should i throw in a mildly built 5.7 hemi that I have laying around.

 

Welcome. Many have done the six on the turbo forum. We are going to do a 318. The 6.1 Hemi is what I would eventually like to put in mine, and I would probably put alot of dough into it.
I like the six idea because it's been done and many build specs to follow and the slant is the easiest to do with minimum fabrication. And it must be lots of fun to lift the hood after beating some guy.