There is more to a cam change than just buying a kit and throwing it in there -
https://www.enginebuildermag.com/201...amshaft-build/
1) What year/model 312 do you have? You have to ID the valve-train and it's condition.
2) Is the engine in good condition (oil pressure - compression - leak-down)?
3) Type of fuel delivery and IGN. If it has a LOAD-O-MATIC SYSTEM still on it (1956), it ain't gonna run.
4) Does the car have a brake booster? Exact type of trans (ID). Rear gear ratio? Tire size?
5) What exactly are you expecting from the upgrade?
6) TED EATON and JOHN MUMMERT are the experts on a FYB, period, ain't no doubt in my military mind. But they have to know what you have and what you expect.
7) ISKY will be the cam provider.
To build a nice driver, you have to hawk it out thoroughly or you may be disappointed and out of a lot of money.
oh! ... forgot (as usual) ...
The F/M torque convertor is in all sense a high stall convertor as it continuously allows a 2nd gear start. You will not have enough camshaft events to require anything special on the street even it was available.