318 or 318 ?? which one

69 may be a forged crank, if original. I don't think cast cranks started till the 70's. I'd say run the 74 and build the 69. I'd put in new brass freeze plugs and a double roller timing set. Main difference in HP between 69 and 74 is gross and net. You can get really good mileage with that 74 2 barrel carb.