273 auto trying to find the 'tick'

Try to find a flywheel that goes with that bell housing. That's a '64-6 273 bell that came with the 9 1/2" clutch and small flywheel. If you have a slant 6 flywheel, You may be able to get most of the flywheel bolts to fit into the crank. The flywheel bolt pattern is different than a V8, and I've never actually tried to mount one, but, worth a try if it will work. Even if you can only get 3 of them in, if they're staggered a bit, it will work good enough for your test. Keep in mind that the '67 and earlier slant 6 had a smaller diameter center hole than the '68 and later (and V8's), so, don't go buying one until you get the specs.