Looks like you got a great starting point. Your car is about a two on the general collectible scale, and I would say about a four on the Mopar scale. It's a 318 Satellite with bench seats, no console, basic wheels, and... green in and out. Can't get much worse than that unless you are really into green cars. But the good news is you've got a 72 and there's plenty of used and re-pop parts to build it into something awesome.
The biggest challenge with green, or blue, interiors is they only look good with green/blue or white exteriors. If you want a color other than that, you'll need to change the interior color. I would also ditch the bench seat up front and change to buckets with a console shifter, but that's just me.
As for the drivetrain, I learned a long time ago that if you're not staying stock, buy the biggest and best engine you can, which for me has always meant getting a 440. I know too many guys with 318 cars who drop a couple of grand into going to a 340 or 360, and then a few years later decide to go to a big block and they find out most of those $$$$ they blew on the small block can't be recovered and sell a $3,000 engine for $750. I prefer to spend my money once and get the most bang I'll ever need.
As for paint and body, check your local craigslist for pros who do work from home. You get the same quality as you would from the shop they work at for half as much and twice as fast.
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