[rtstrack]

So I purchased my first cobra with a 428 big block in it, only to realize that I don't even know what kind of gas goes in it. I was told that the block was from the late 60's, but i am assuming it has been rebuilt since then. I think original engines back then ran on LEADED gasoline, but i have no clue, that was 20 years before my time. I was also told from the prior owner (a used car dealership) that they were using "racing fuel" in it. Can't i use 87 or 93 pump gas in it? ANY help would be appreciated.