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Can anyone identify this engine? 8th digit in vin is a J

Well guys, just picked up an 81 Regal. Engine appears to be a pontiac 4.3 v8 and thm350 trans.. new to the Gbodies but I already know this engine has to go. What is the easiest most direct engine swap? I'd assume another pontiac and perhaps oldsmobile v8 would drop in? Kinda hard to find where I...