inherited dodge dart swinger

Hello all,
I've recently inherited a Dodge Dart Swinger '71. It has a tired 318 that I'd like to put a newer engine in but convert to carb. I'll probably need a lot of help. I'm more of a maintainer than a builder.
Tom
newer engine as in what? modern hemi? big job and can be pricey too. why not redo the 318 or stick a nice running 360 in it. being its already got a small block in it would make it the cheapest route.