Help identify Engine

either LA or B/RB family of motors will fit, its the exhaust of the B and RB thats a bear in a narrow A (64-66). @RustyRatRod That 360 is gonna have rotators on the exhaust valve springs, not performance oriented. I got my 360/4 out of a 86 'Camper Special" truck and it was low mileage, perfect std bores and had the rotators.