A couple questions for anyone who has gone from a 455 to a 454. Is the 454 physically larger than a 455? I have only about 2-3 inches between my back seat and the pulleys on the front of the crank. If a 454 is longer then i will have to modify the back seat to allow the 454 to fit. Also what about motor mounts. I have 3 point motor mounts not which work fine, do they have them for a 454?