The 7 digit # I found is 6461970, it was Located at the right side of the fan. Help me out to know what engine this is or at least what it started out as.

that is the engine serial number
look for another number same area. . 5 digits with a / in the middle - something like 911/41, which would be a 75 911s 2.7

1976
911 911/81 165/5800 235/4000 9116300001-9116301868 6360001-6363029 1868
911 Targa 911/81 165/5800 235/4000 9116310001-9116311576 s.o. 1576
911 Sporto 911/86 165/5800 235/4000 s.o. 6369001-6369435 s.o. Sportomatik
911 S US 911/82 165/5800 235/4000 9116200001-9116202079 6460001-6462305 2079 ********
911 S US Targa 911/82 165/5800 235/4000 9116210001-9116212175 s.o. 2175 mehr Targas wie Coupes?
911 S US Sporto 911/89 165/5800 235/4000 s.o. 6569001-6569160 s.o.
911 S US Calif. 911/84 165/5800 235/4000 s.o. 6560001-6561837 s.o.
911 Carrera 3,0 930/02 200/6000 255/4200 9116600001-9116601093 6660001-6661385 1093
911 Carrera 3,0 Targa 930/02 200/6000 255/4200 9116610001-9116610479 s.o. 479
911 Carrera 3,0 Sporto 930/12 200/6000 255/4200 s.o. 6669001-6669212

911/82 should be the other number on the engine!

This is where I found the info Sorry it is in German 911 Identification

cool, I will also get over there and see if I can find the other # just to confirm. thankyou.