360 Tune Up

7.375/7=1.054 and crank is bigger than the WP so you are good to go, IMO. Yeah you could spin it faster, but with overdrive you are not working the engine as hard so shouldn't need more Rpm. Run it in direct and see what happens.

My no A-C system is underdriven to keep the belt on at 7200. I am geared 65=2240 and my rad is from a 73Dart 318/A-C, with zero problems since 1999. I have run as slow as 65=1600 and as high as 65=2970, still with zero problems.
Are you by any chance running hypers at .0015inch clearance? I found that to be too tight,in spite of what KB says. I can't find my last assembly specs but I'm pretty sure I went to a tic over .0025, and that loosened her up. It rattles just a bit on cold mornings. In compensation I cranked the minimum running temp up bit by bit and finally hit 205. That's the sweetspot on my combo.