$30,000 is a bit more realistic if the body is as good as it looks. If it's rust-free then it's a good buy.
I'd definitely leave the 308 in it unless you are wanting a totally stock van, even then I see no reason to go backwards.
The GTS wheels will save you a grand if that's what you were thinking of using.
Get it running and use it and just do improvements as you go..... the best thing about having a cool van is getting out there in it!