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If I'm not mistaken, the motor mount perches (that attach to frame) are different also, and would require different ones for a 302/351w swap, however the bellhousing would work for either of these, or if you're lucky to find a 351c, even a 2v headed one, would bolt to the tranny. On the plus side, a 351c is going to weigh less than the 351m/400, or you could investigate a clevor swap. Once that problem is solved(whatever you finally decide) the next thing would be to make sure your radiator is keeping the larger displacement engine cool.