There isn't any problem mounting the V8 in the dart as long as it is one of the small blocks, it will bolt right in. A big block takes either different mounts or a completely different "K"member in some years.

You should look at the numbers on the rear end, some of the darts had the V8 rear ends in them regardless of the engine and the drive lines are very close too, I know my bud has 30 darts at his place so we have done alot of research.

It is really an easy conversion, I would look up the numbers of the 360 on "Big Block Dart", that site has many charts and very knowledgable mopar freaks. The reason being is that some of the 360's where made for pulling and don't rev up very well. They where usually in the heavier trucks and 4x4's. There is a fantastic variety of speed parts for the 360 including heads, cams, manifolds, about anything that is out there. I think you'll have fun, keep us updated.