I bought a 39' flathead that had been rebuilt in the late 60's and run very little. I pulled the heads and intake off and it looks clean inside. The motor has a four barrel Edelbrock manifold, the pistons are marked .125. Is there any way to ID the cam?
You could ship it to Moon and have Bill check it out on the cam grinder.... he could tell you all the specifics...
Yes, most aftermarket grinds will be marked up front...you might have to remove timing gear. Once you get any fragment of ID, someone on here will have full catalog information. If stock, there's nothing much to ID as timing was the same '37-48, except which length cam it is (pre '42 or '42-8) and whether you need a spacer or adaptor for your distributor, but presumably that was all already worked out on your engine.
The 5-7 could be 5-T - which is a stock marking indicating it is a reground cam. Weber had several grinds - typically denoted as F1, F2, F3, etc. Never heard of R1C, but that doesn't mean a thing - try posting these numbers over on Fordbarn.