Hello, i've got a 1957 f600 with the stock 272 yblock fresh rebuild i am the 3rd owner and all other owners were family so, my grandfather said he had the engine rebuilt less than 100 miles ago (in 2013) i am in the process of restoration and about ready to begin driving it soon and i know enough about the rest of the truck but im not so good with gassers mostly diesel is what i dealwith around the farm here but to cut to the chase what would the best octane be to run in this stock engine? Premium is what i was running it since the rebuild but is premium best for this engine?

Thanks