Timing Chain Cover crankshaft opening is the wrong size

You can put your own TDC mark on the balancer or the cover, anywhere that is convenient, which makes matching any of these parts a non issue. You can even use the 273 style removable timing tab, if it fits.
Then you can either use a dial-back lite, or install a timing tape, or just mark off appropriate divisions.
As for the cup on the balancer, that is there to house a big felt sponge to sop up the oil from a leaky seal, after the rings start blowing more blow-by than the PCV system can handle, or whatever, lol. Keeps your garage floor clean for a week or two.
If my set-up wouldn't accept that cup, I sure wouldn't buy a different balancer just to be rid of it; I'd just zip that cup off there in a heartbeat.

One thing you gotta know is this;
on the driver's side of the front of the block, there is one W/P screw hole that is open into the water-jacket, in line with a cylinder, (I think one of the long ones), that if a too long bolt is installed there, you can screw it right into the cylinder wall and crack it. Be careful.

@fulltank
I have at least a dozen old and cleaned up covers, if you need one, PM me.