Which carb do you have? The weber is an edelbrock and the parts are readily available at your local speed shop. The merc kit is like over 100 beans. Merc rebuilds are over 3 and you can get new edelbrocks ( marine) for like 330 ea new but they do have electric choke. The edelbrocks are set up out of the box a bit richer than my mercs were but I had to richen the mercs up a bit.