Need Help on a Flywheel

See if the bell housing will bolt up to the V8 without a flywheel first. If it does, get a V8 flywheel the same diameter, offset, and ring gear tooth count to bolt in there. If the bell housing doesn't fit, get a complete small block 3 speed bell pack out of a pickup around the same year. A 6cyl. flywheel has a different bolt pattern than a V8. Check to see if the 273 crank is machined for a pilot bushing or you'll have to get one made or the crank machined out to the proper diameter.