in a tough situation

[Matt Man]

Well as of right now i have my c30 crew cab dually No rust very solid everything works and only needs seats redone and paint and it is a finished motor/trans only have 20k on them.

I could trade my truck for a 74 k20 long bed with a 350/400 has 44 up front and 14 bolt w posi, Ac doesnt work needs some parts but compressor is there and the unit is on the firewall. Has a crappy paint job on it and the body work was half way done good, might need a driver door as the bottom corner was a little gooey, needs the dash gone through, has a little bit of rust, needs some carpet and door panels. Also has a 87 front clip installed which i dont mind for, has a 6 inch lift with 35s and 4:10 gears front and back.
Worst case is i could sell this truck for more than what my c30 is worth if it turns out to be a roach.

c30 positives: i know the truck in and out, im the 2nd owner, Everything works, no rust mostly done.
c30 negatives: Needs paint and seats redone Hard to park at school could use a little better mileage not worth as much as the k20.
74 k20 positives: Suspension is done motor/trans runs very good, could see better mileage, easier to park, more desirable if i need to sell, NO SMOG!
74 k20 negatives: Worried about whats under the crap paint job ( bondo ) , some of the body parts dont line up at all Ac doesnt work, Needs some more tlc than my c30 does.

What would you do?