will upgrading from stock 22" radiator to stock 26" make any difference????????????

Well, you have about 80 more sq. inches of radiator surface exposed for cooling as well as about a quart and a half more water.
And in old cooling systems, every little bit helps.

If you use the A/C water pump pulley as oppossed to a non A/C pulley, your ratio on the water pump to crankshaft speed goes from .95 to 1.20.