Re: 1982 Baja 16 ss
Problem 1: That boat has been out of production for many years. Problem 2: Just within the past couple of years Brunswick "sold" Baja to Fountain and then Fountain went bankrupt....so even IF any parts still existed (which they probably don't) they went away with the Fountain/Baja merger.
You're going to have to go directly to the manufacturer of the parts you're looking for, if they even exist anymore. Everything but the hull came from another manufacturer so you don't necessarily have to go through Baja for parts (is this way on most boats). As for decals, try eBay. There's a guy on there selling the old sunburst Baja decals pretty reasonably if that's what you're looking for. Great Lakes Skipper has some parts, but mainly for later models.
As for the prop, have you run the boat yet? Need to know rpm and GPS speed at wide open throttle first (at a minimum), then can advise as to whether a prop change would be helpful.