If the front crossmember hasn't been replaced yet, it's very likely that the car will need it. And a bad thing about them sometimes is that they rot from the inside out and often look okay when they're not. I had it replaced on my '56 with a new one even though my parts car's appeared to be okay. I didn't want to trust it.
If any cars you look at are from the rustbelt, you'll likley find most of 'em are gonna need inner & outer rockers, most or all floorboards, and body mounts. All of it is available from a variety of sources, EMS, Mac's, Carpentar, etc. I got the replacement front xmember off ebay.