The motor is obviously not original and was put in back in the 70's. From its internal condition it probably has no more than 10K miles on it and is 100% stock (even the exhaust and muflers are factory installed originals). The valve covers look to be the originals that came with the engine and say 290HP on them. The numbers off the engine are 13N145650 and V0215CRD.

When I did a quick search I found two possible engine matches... a 1972 350/165HP and a 1975 350 with no other details. Regardless of the stock power rating I am thinking about doing a head/cam/intake upgrade in he future. I figure if the bottom end is in excellant shape I might go ahead and pump up the top end with something that will work good with the stock bottom end.