Crankshaft

Hello.
last year i bought a 1977 360 engine.
I have taken it apart to renovate it, but i have run into problems with the main bearings running tight, the wax thread being masted out to 5-6mm which equates to less than 002 inch clearance, which is way too tight?.
I have tried two sets of main bearings from speed pro and I think maybe I should try another brand of bearings? and see if that can solve the problem.
the crank is standard dimensions

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Do not order more bearings. If you are ordering anything, order green plastigauge and check the clearance again.
How much power are you trying to make? A mostly stock 360 engine can use stock bearing clearance as low as .0005" and run 10W30 engine oil. Measure it again.