I am putting a 351C in a 56 customline. The motor fits like a glove. I used motor mounts from www.speedwaymotors.com Used the small block ford universal fit mounts. Took some doing, but turned out really nice. I also used a speedway trans. crossmember. I am using an AOD tranny, by the way.

If you use a C6, you will have to raise the tunnel. the AOD fits, and a C4 fits even better.

For headers, I used 71 cougar/torino/mustang w/ 351C and C4 and they fit VERY nice. No alterations were needed. For steering, I am using a cavalier rack and pinion set up, using brackets from fatmanfab.

Please keep me posted on your project. Sounds like I am a few steps ahead of you, so if you have any questions, feel free. Or, suggestions, for that matter. I have done hours of research but I a m still finding new stuff.