I ran an "Offenhauser" tunnel ram on my car with a set of 660 Holleys for a bit before switching over to the M1 Tunnel ram. The M1 ran leaps and bounds better than the Offy. Is the M1 that much better than Offy or is the Offy just for bigger motors or what? My combo is a stock 73 440 bottom end, 7.8:1 compression, 295/557 Purple cam, 906 heads w/template porting, 1 7/8" headers. 3500 stall, 4:30 gears and 3760 w/driver. 12.30's @ 109 was it's best with the M1 tunnel ram. Should I give the OFFY another chance or is it always going to be a 2nd best?