Another option for you would be to buy a timing gear set that has 3 slots on the crank gear.........1 for straight up, 1 for 4 degrees advance, and 1 for 4 degrees retard. This is what I did with my 340, with some advice from guys in here (I would probably have better luck degreeing a toaster) and ended up running it straight up. It runs excellent, but I always have the option of going in later and advancing or retarding the gear.