Blazer Won't Start

Okay... My 92 started running sluggish a few days ago, my hubby changed the dist cap, plugs, all that general stuff. Everything looked fine.. I took it for a test drive and it stalled on me. It would start, I would creep along for a bit, then it would die on me.. And finally it died alltogether. I saw white smoke coming from my exhaust before that happened. I am going through the antifreeze overflow like crazy.. Can't see any visible leaks. Fuel pump is turning on but my poor truck just isn't starting. I pulled the oil dipstick out and it kinda smells like gas :0(... It has 146,000 miles on and I have really had no problems with it until now. Any ideas/comments/etc.... Do you think it may be the head gasket?....Engine gone?

There might be two problems here. Check fuel pressure first, should be 9 to 13psi at the pressure test port, (next to the injector).

The white smoke is probably where the coolant went. These are known for the intake gaskets leaking into the cylinder head in the corners.