62 Valiant, '69 parts car - what'll work?

Hi all, it's been a while. The intact '62 Valiant I pulled out of a wrecking yard last year actually woke up easily and runs and drives. No brakes & nds gas tank, but we'll get to that.

I have a parts '69 6 cylinder Dart for my other As, all later... wondering what (besides underhood & wheels) off of it will be useable in the smaller '62 in the following areas:

FUEL TANK
BRAKE SYSTEM
SEATS
SUSP.

Thanks so much!