Here's another sacrilegious engine swap question.

Does anyone know how much grief and hassle it is to swap a 454, (with a TH400 that fits it), into a 67 Caddy?
I am mostly concerned about oil pan/crossmember/ steering parts not clearing each other. The wiring, plumbing and all that is no issue for us, I can move motor mounts as well, but if we have to start cutting firewalls or pans or crossmembers or move steering boxes I'm going to pass on doing the job, as it would be easier to build the wore out caddy motor.

This is not my car, I am asking for my neighbor, who asked me to help him with the swap if it was possible to do without turning it into a career.

Thanks for reading this,
Mikey