totally different. 73+ = rubber isolated + different engine mount perches (welded on from factory) for SB and BB.



Are you using stock BB spool mounts in a SB k-frame? I have to ask because I have a 440 in my car and a generic 440source deep sump pan and it clears totally fine. When I bought my car it had a stock (1976 passenger car) 440 oil pan on it that the last guy had to clear the k-frame because he did not use the proper conversion motor mounts when he put the 440 in where the 318 was. After I put in the conversion mounts from engine-swaps.com everything fit perfectly.