I have 1970 fastback and a 429 from a 69 t-bird. Does anyone know if I will need to modify anything to get thing engine in here? I thought that since there were 429 boss mustangs that my standard 429 should fit. I measured the engine accross and the distance between the shock towers and it will be close but, it looks like it will work. Has anyone done this that can give any advice? Thanks for any help.