theres a thread on FABO somewhere about a stereo system with no head unit. you can run through an auxillary cord and use your ipod or other MP3 device, and leave the stock radio in the dash for the look. Ill see if I can find it again.
i have bucket seats out of a 76 volare roadrunner, they look just like 70 A body seats. I was thinking of using 70 foam and covers, i wonder if i will run into the same problem?