Oddly, Howards makes an exact copy of the C3OZ-C, and the C7FE-A. But their "near duplicate" of the C9OZ-C has .017" less lift on both lobes. I knew one of the Ford engineers who designed such stuff, and I'm pretty sure he was a lot smarter than me. Besides, if I wanted a "sort of" cam, I could use anything. If I wanted exact, I'd use exact. Like I said, these guys were pretty sharp. The old Cobra manifold is only off about 3% of the best computer-designed intakes today. And they used pencils and slide rules.Howard Cams have "Near duplicate" versions of some of the old Ford cams. #217081-13 is a C90Z-6250C copy. If this wont do the job, I kind of wonder what you are building?
And I appreciate the idea of using "nostalgia" as a guide. My whole car is done as though the modifications were done when it was new.
I was involved in the restoration of a low-mile 67 GT350 a while back. The restoration was stone-stock, except for long-tube headers, side exit exhaust, and Torque-thrust wheels. The wheels and exhaust were installed the week the car was delivered, so we restored them, too.