The 122 tooth flywheel and 10" clutch is marginal on a stock Commando 273. If you are using a 360, bite the bullet and get the bell housing and special parts to swap to the 10.5 and 11.95 clutch set up in an Early "A". .
I just bought a brand new Kevlar clutch disc and B&B pressure plate for the 10" scalloped pressure plate setup. I know that setup would work on a 360 because of the added clamping characteristics of the Kevlar disc.
How does the larger bell housing and D450 headers work? Not much room with the smaller 273 bell housing. Looks like I'd need a new bell housing, 360 flywheel, clutch disc, pressure plate, modified z-bar, roller bearing, and a modified (?) clutch fork. Over a grand in parts?
Maybe I'll have to put a 273 that I have had sitting around for a while. I'll put in a nice hydraulic cam, D4B and an Edelbrock carb. All parts that are laying around.
