Jay B How about your 350? Im still fooling with mine. It runs good and snappy in the first 3 gears. 4th will pull and wind up but 5th just goes flat. 70 mph its all done. I have throttlle to spare and twist but it wont sputter, bog or anything. Ive got 4>1 mac and 75 jets. The engine was rebuilt by a previous owner and I dont know if it was bored out or not.Im thinking of trying 80 jets and retuning. My next tool purchase will be a timing light. Sorry if this is off topic. But my 75 550k will only go @ 90.Guess I need to tune that one more also...