As far as front to back the 302 and 351 are the same as far as I know. You shouldnt have any problems with alt, p/s, ect, this stuff should be the same distance from the rad on a 351w and it would on a 302. Now for the centri blower..I'm in the same boat. You can use solid drop motor mounts to fit the blower under the hood with 302 brackets. Otherwise I think its $199 to get your bracket modded for a 351w. With as many people that are putting these superchargers on 351's in these cars these days you would think that Vortech, Paxton, Procharger, ect would make 351w brackets. Correct me if I'm wrong, but I think you you have to use convertible motor mounts for the 351w swap into the fox cars or for LT's in general maybe. Anyway with stock motor mounts and stock 302 bracket your blower will be around an inch higher on a 351w due to the extra deck hight.