Slant 6 work truck

Hey guys I have an 85 D150. It has a bone stock 225/904. So far I added an HEI module, new cap, rotor, Accel SS coil, spark plugs, and adding a Carter BBD to it. My goal is to keep everything as stock as possible if I can as far as bottom end. I'm mainly using this truck for daily driving and towing/hauling. I'm not looking to rev it to the moon, probably no more than 4-4500. As far as budget goes I'd like to keep my costs as low as possible. Looking for opinions on turbo choice. I can fab all my brackets and piping so that alone will help cost.