A-body trade for a B-body???

I wouldn't think twice - especially since you have 2 of the exact same body styes at home.

If it comes down to value, even though it's not a real Road Runner, if it's an original BB car w/ original drivetrain, I'd say it's easily worth $5k more than a comparable-condition A-body. B-bodies are worth more - it's just the nature of the beast. They're more desireable in the market, and even though it's a Satellite, it's an original BB car.

BTW - as a huge fan of 68-70 B-bodies, I have to say that the 71-72 Plymouth B-body is a sexy damn car - I would love to have one.