1973 360 upgrades

If you have a freshly rebuilt 360, No use in swapping it for a magnum now.
With $1000 – $1500 to spend get an Eddie Airgap, 600-650 carb of your choice and see the difference. If you want more performance, get headers and look into a free-flowing exhaust setup. Everything on this list should be in your budget if you find good deals.