what kind of torque can you get with all the bolt ons and cam?

Start with an RV grind cam, I'd just use a 2bbl and a stock 2bbl to keep velocity up and rpms low. If you already have the intake. Use a tiny 4bbl like a 390 or a 400 carter. Holley made a mileage master 4bbl carb that had very small venturis and I think a Buick used it as an oem carbs I think it was about 450 cfm. Dual exhaust joined 10 feet back or a long tube header would help too. Ultimate torque would be turbocharged or eaton blown.