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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

Comp cams 268 int./280 exh. 10.5 to 1

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...

Hi i have a 71 demon 340 the engine has all new parts. I decided to put fitech efi on it and ran good til coil blew up. Hasn't ran since