the vol. 1, number 1 August 1951 issue of Hop Up has an Isky ad at the bottom of page 38 that describes.... "A special brochure prepared by Kenny Bigelow is available. It gives important facts on converting the GMC engine for racing or fast road car use. Be sure to ask for it when sending for our (..Isky) catalogue." does anyone have a scan of this brochure or have a reprint available?