Those numbers are pretty close to stock, probably not causing the problem. If you happen to pull the oil pan and have a stock pump on hand, it might help to use it. From your original description, my bet is a piston/cylinder/ring seal issue.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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