I have put a new impa carb vaporizer and regulator on it. Engine compression is 150 psi. Propane tank is full. New plugs. Tested spark and it's hot and blue. I can't get it to run on starter fluid. I tested charge and alternator doesn't charge. Also water pump is loose. I've tried timing change no good. When I started this it would start and run and no rev. I'm still at the same place. New compression check on all 4 not just one. No compression on 1and 2. Blown head gasket. Anyone tell me where I can buy a water pump rebuild kit? And which alternator to get?