Ramcharger questions

So, I've been doing a lot of reading and research on this matter and am posting this here because of the vast wealth of knowledge FABO represents I know I'll get a lot of good input O:)

I've found a solid bodied (non-running) small block late Ramcharger with the fully removable hard top. Plan is to get it running reliably/efficiently, use it as a summer cruiser to the lake/beach/mountains/etc. I already plan on modifying/expanding the roll bar into a more complete roll cage, cleaning up the interior but nothing fancy since it will be topless most of the year. My question comes in regards to engine/trans...

I want something that is turn key, that I don't worry about cold starts in the mountains in the winter, something that gets (relatively) decent mileage, not have the full time 4WD, etc.

I originally thought that I'd just swap the body onto the frame of a 90s ramcharger and keep its running gear but the body mounts are different. I haven't had a chance to crawl under one and see how different and if it would be easily modifiable.

Would it be better to swap in a 360 and trans out of a late 90s ram? Try to tackle the differences in body mounts and just swap bodies?

Just curious what your guys input is...