I am putting a 351W into a 1979 F150. What motor Mts will I need. I have the original 302 mts and a set of 351M mts. Also The crossmember I have says "4 speed" on it. I will be putting in a C6. Do I need another crossmember? Any help would be appriciated. I am also putting on a wood stake body. Anyone out there have any ideas or prints I can look over?