Did you plastigage the clearances when you were installing the crank? When I had my crank ground I still made sure the bearings going in were the right size before it was too late (they were within specs on the tighter side which was good), but I wasn't about to trust the guy who helped me load up my block/parts at the machine shop. I'd look into the pump and even the oil pressure sending unit, you could always buy one and try it, then if it doesn't change anything then return it.
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1990 Notchback: BBK Ceramic Coated Full length headers, Dr. Gas 3"- 2 1/2" x-pipe, Flowmaster 40's/turndowns.
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