Can use some Thermostat and Rad Cap advice

Thanks everyone! I'll try a high flow 160 stat if only because the system currently seems to do fine with flow sooner than later. I'll keep the 13lb cap.
Any suggestions on how to order the correct shroud when you don't know where the Rad came from and have no P/N tag? What year did the hoses both end up on the driver's side? Originally my car came with a Slant 6, but had a donor '66 Dart GT V8 installed. But, I don't think the bottom hose switched sides that early.
Thanks!