Hey Mike,
Don't overlook the core charge. I think that will cost about $300 if you keep yours.
I would just buy it and slap it on and enjoy. Inquire into warranty.
I spent years worrying about parts on my restored cars and when I look back now I wish I was driving them instead. Just my 2 cents.
Only problem I have had with those units is surface rust on exterior. I had to remove a 2 month old one on my c10 and paint it. Was bare metal! My hand prints etched in rust! So hit it with some clear or silver or your favorite color!
Mike