1985- 944 Engine Issue

I have a 1985- 944 that I bought after it was in a collision. We had the body pull out and repaired and when I went to start it it would crank and not start. While it try's to crank I get the anti-freeze flowing into the resovuior. When the cap to the anit-freeze tank is off it actually flows out until I stop cranking the enging. We tried to start it while spraying starting fluid into the air intake and it fires up but idles rough. When you stop spraying the starting fluid the car stalls out. The car sat for a few years, we put dry gas in as well as new gas. Could it be a blown head gasket? Could it be something else? I really don't have a clue.