302Guy

Thanks for the advice, but which engine would be better...a 351 Windsor or 351 Cleveland or a 351 Modified?

Hey everyone, i was wondering what size big block engines would fit in a 1969 Mustang? It has a 302 in it already in it, but i want to go bigger. So if you could help in telling me what sizes would fit and where i could get them, that would be awesome! Thanks 302Guy