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How to figure out if my oil leak is from the rear main seal or rear oil pan seal on 71 340

I have 1971dodge demon 340 that is .30 over flat top kyb pistons ,comp cams 268/280 ,750 double pumper, edelbrock rpm air gap port matched and headers 3.73 gears and with automatic. My engine builder said it might make 400hp but he said it's hard to get that out of 340 unless you stroke it...