1991 4.3 vortec in my 81 Chevy wagon. lately its been starting slow and the smell of gas is pretty bad when sitting after shut down. I started searching and noticed the fuel in the manifold area and when i had it ideliin i noticed the fuel puddeling at the back of the throttle body. My question is. (never took one apart) can I get a rebuild gasket kit for this? and also could there be a problem with my return line to the tank being too small and its causing the fuel to build up to much pressure.