[shommel]

will i have to change them on a 67-70 mustang if i wanted to put a 427 in them?they are all v-8 cars a 289 -351-390. also what about the motor mounts and any other thing i might have forgotten?

[fastback68]

the motor mounts are different than that of a big block car. The frame mounts are different also. You are attempting to install a 427 into what car ?

[shommel]

well i have 3 427 side oilers and want to put one in a 68 fastback a 69 fastback and a 70. how much work and cost is required?

[andrewmp6]

You'll need the fe motor mounts frame mounts too big block front springs a 9 inch rear end to handle the power.A tranny a toploader or c6 crossmember to match the tranny.Bigger radiator if the cars got front drums disc are a must to stop it with the extra weight.And to do it right a shock tower reinforcement kit since ford did put a extra brace on the shock towers down low on the big block cars.