Is there any engines that are enterchangable with the 75' dart sport with the slant six? Prefferably a v8 like the 318 or anything. Also what kind of horsepower can be pumped out of the 75' slant six?

Ummm, could you be more specific? Any parameters on the engine buildup such as cost? You could probably pump out well over 400 horsepower with a turbo and nitrous and a whole bunch of custom machine work.

Short answer onthe v-8- no. Everything is different. A slant six to v-8 swap is certainly doable(I've done it), but it is very involved.

Reed