Centering mine was a ton of work lol. Did you modify the inner fenders? I seen that in tincups 63 build he trimmed it. Looked like it helped with passenger side clearance.
Man I was way off on the offset. The mounts we're using and the setup of the HDK k-member the motor is only 1/4" offset to the passenger side.
No I haven't had to trim any fender wells or frame rail.