Pieman Use what I use HEI tough,permanent,powerful,any FLAPS can help. Stay away from offshore new ones find used domestic distributor can modify with tools you probably have now. My 4 all run fine,watch for interference on the hight of it to the side of your engine. You'll be amazed how tough these are,never wear out of spec. Get one not computer controlled is just a complication you don't need.
