Cheap-ish 360 mods

If that 360 is actually a 1991 model year, it may have a factory hydraulic camshaft and good heads. If so, keep the factory lifters, get the camshaft reground to match your build specs, and put a nice dual plane intake on it. Still budget minded but plenty of street power with the rest of your plans.
Keep the factory intake to help the budget if it's already a four barrel carburetor intake.