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100 octane isn’t going to work unfortunately.best I can get at the pump is is 90

So I’m not sure I even belong on this forum. I don’t own a Syclone or Typhoon. But what I do have is an 88 Chevy single cab long bed with a 4.3 I recently trashed. Since I’m building a motor anyways I figured why not up the power some. I’m going for around 300 horsepower. I notice the 4.3 in...