If it’s in fact a TD-20, that motor was produced from 1946 thru 49. The serial number you reported seems to be missing a digit. If it were number 561359 0r 613590 thru 613599 it would be a 1947 year model. And yes, it would be 5hp.
Bob
1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
1957 Evinrude 3022
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20
1982 Evinrude 25hp
“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."
