fattest cam in a 340?

Agreed here and to piggyback and help you out, here is an example of my old cam and the numbers stamped on it. My numbers were on the backside of the cam so I guess it depends on the cam company. This was a Schneider racing cam. You should see something similar on the snout. I love showing pictures to help, so all you have to do is ask. We are all trying to help you out so please listen to all the advice and don't take it personal as we have all been in your shoes at some point.

Yes, but you'll have to remove, at least, the timing cover and cam timing gear to see the end of the camshaft. There should be some numbers there...a grind number and (possibly)manufacturer...then Google that and find the cam (spec) card (hopefully)