Dang, you got a steal. Old mags sell between $16-23, average is like $18. I have well over a dozen old mags, several purchased for $18 not including shipping. I just purchased a Car Craft issue for $25 including shipping, in order to get the whole scoop on the gear drive. I have like 5 mags that feature the Cobra and like another 8 on my wish list that cover the Cobra. I own both Hot Rod issues that cover the SOHC, this one and the newer one covering the all aluminum SOHC build. In digital form, I also have the SAE paper on the SOHC and the engine manual, both in pdf. The engine manual pdf was created by me from scans that a contact sent me.