The chevy is a nice car to rod and it has alot of potential, the merc looks ready to drive now and it has a V-8, the pontiac is nice but you be spending alot of money to upgrade it and the 65 chevy belair is good. I would go with the 65 chevy and find a 327 which woudl bolt up real easy. It all depends on what you want to put into it, but being young you can drive the cheby or merc now and have some fun.