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I believe the cast iron bellhousings for the 351 engines were built for the 164 tooth flywheel and the aluminum housings (289/302) were typically for the 157/160 tooth flywheel. This has implications for the flywheel, clutch fork, clutch, bell housing plate, and starter. I think either will fit but all parts must be compatible with each setup. There may be some exceptions to the above, but I think its true in most cases. I would guess that the 164/cast iron set up is probably stronger than the aluminum one, but I don't know if must be considered. Back in the 70s, I modified a 164 tooth aluminum marine bellhousing to accommodate both types of flywheels by adding starter bolt holes for the 157 tooth starter position.
66 Fastback
85 GT Hatchback
67 Coupe
82 GT Hatchback
66 Fastback
85 GT Hatchback
67 Coupe
82 GT Hatchback
