lookiing to buy 69 chevelle, what gas to use

[kevinw]

question. I basically have determined that my 69 has the 255 hp version of the 350 engine. it is match numbers, and previous owner said it had a 2 bbl carb originally.

question. what would be a good guess on horsepower now with the long tube headers, 600 carb, alum intake, and open air cleaner? thanks