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A pitiful one.....get a Crane Fireball-I....this was the hi-po 289 'cheater' cam from the 60's/70's...When I bought mine Crane said it was the most cam a stock 289 head could flow. They said it would pull like a freight train from just off idle all the way to 6500, assuming I had the right intake, carb, headers. I ran a 650 double-pumper with the 67 Cobra (F4B) with tri-y headers and a stock single-point vacumn advance distributor. The car would almost stay with an 87 350 Z/28 and would kill an 87 GT.
FYI....the intake is modified with a cut-down (3/4")plenam devider to extend the rpm range. An old Shelby trick.