You have given a very valuable receiver. That model Collins sells for big bucks on E-bay, depending on condition of course. Can't help you with specific advice on bringing and checking yours out but there are many vintage collectors and web sites that should give you tons of information. Probably well worth a professional check out if you plan on keeping it long term
Some guys have all the luck.
I would rather have your model SW receiver instead of the Collins R-390A that Sandy says he is going to give me some day
Lefty