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sportster
74.5 hp
.040
74 cubic inches
under the seat.
You can obtain a wiring diagram from the Harley parts site. Go to the Related Links for the link.
that means it is (or was originally!) a 1200cc engine produced from august 1965. the D denotes that, the rest of the number is your serial number.
1200cc
Yes it is possible to put "Forward Controls" on your Sportster. If you would like to see a few option available here is a company with an online catalog look under foot contols. http://www.customchrome.com/dcm/cc/index.asp
1955 1200cc
1955 1200cc 36hp
1200cc = 1200mL