I had a 429 in mine and still have the solid mounts I built if you can use them.
I used an econoline axle because I had it and ...well because. I narrowed it to the same width as a model A axle. I found that 96 Crown vic rotors slid right onto my hubs. Speedway said the Posies spring would hold up the engine. I never drove it but it laid the spring out pretty flat.Now I have to deal with that ugly steering arm.