You would have to get the 273 flywheel balanced for a 360 and wouldn't require tearing the engine apart. Another easier but not quite right way to do it is to put a B&M 360 flexplate between the crank and the 273 flywheel. I think Brewers or any good local machine shop could set up your flywheel for a 360.If you do go with the 130 tooth flywheel it is easier to use the short clutch fork since the long fork will come close to the torsion bar and will take up room that you will need for the exhaust.