[U47]

Steve, they are Pontiac grind cams and part #'s----most of them done by Mac Mckellar or McKeller had a hand in doing them. Melling most likely uses the same part # and they might have supplied the cams to Pontiac in the first place. If you have Pete McCarthy's book those cams are listed. A word of shock when reading about the lift on the intake side. The lift seems a bit low .374 but I can assure you would never know it as most of the breathing is done on the low end side anyway--that's why Pontiac intakes are ground at 30 degrees. I hope you have some 0-5% ethanol stations around, anything more than that and the m.p.g. numbers start to fall off.
Steve, you didn't mention what heads and compression your using... Open chamber heads are more efficient.
I mentioned the 2.56 rear end because with a 455 the darn thing has enough torque with that axle ratio, so you don't need a overdrive and the extra weight of it to go along.
D.

[android 211]

Years ago I used a Crower Baja Torque Master cam in a 350 Pontiac. It was a 2bbl engine originally but I swapped in a cast intake, Rochester and duals. It was a '69 Firebird convertible. The dizzy received lighter advance springs. Once I got 24 on a trip; usually on any long drive it would get over 20. The Crower had .435" lift and 205/205 duration IIRC. It had good power past 4500 rpm. I did 125 in it once and had more left. I'm sure the rear axle was something taller than 3.08, probably 2.78. I recall Hot Rod magazine testing a SP2P on a Trans Am and saying it pulled past 4000 but somehow I'm doubtful. I have one I got off ebay; the runners are really narrow. If you're interested, PM me. They come up on ebay frequently, no one ever advises they're a mpg intake. I recall reading Edelbrock advised against using them with mileage cams as they would cause detonation.