Once again I must appeal to the collective wisdom. It runs good up to 3/4 throttle then misses. It's a '49 with front mounted distributor. I have cleaned carb. New points, condenser, 12v coil, plugs and wires, advance weights. Interestingly,it timies 180 degrees opposite of manual(ie, the condenser is on right insead other left when setting timing. Any ideas ?