my 89 tbi 454 smokes a little and I can smell gas. also a ticking noise. It was overheated by my brother and has 163,000 miles on it. I am thinking blown head gaskets and a colapsed lifter. anyone help me diagnose my issue? I am hoping to do a rebuild in the future (may have to wait till garage is built) but I would love tolearn more about problems and symptoms of engines.