Currently I am using the NGK 6987, which is a 6 heat range. I started with the Autolite 3924, but I went through my stash testing carburetors and starting using the NGK's I had on hand.

I was having some issues with the timing gear that came with the engine because it appeared the engine has been line bored, so when I went to the short chain, I checked TDC again. However, now that I think about it I did not go back and check my cam timing.