Here's the deal. I bought this car from a DWI auctions. It was in a tiny front end bump. Radiator support was bent just a hair. Radiator was busted. I replaced the radiator and hoses. Cranked car up. It started to smoke (white) around the headers. Car NEVER got a 1/4 up the temp gauge. It ran for about 15 min. What are some things that I can check to narrow down the problems. Im thinking it's the head gasket...but there was no water in the oil. What would be the best route. Head gasket, header gasket and valve cover gasket? I just want to fix it so i can sell it.

forgot to mention that the car hasn't been started since january of 06

Car is a 94 Del Sol S 1.5 sohc non-vtec

thx