When good is not enough, Camshaft time again.

Kent mosby said
From another site I found the bearing sizes. here is a compare of what I have
bearing size ---------- new cam -------- old cam
1 2.00-2.001 ---------- 1.9995 ------ 1.9975
2. 1.984-1.985--------- 1.9835. ------- 1.980
3.1.969-1.970. -------- 1.968. ------ - 1.967
4. 1.953-1.954. --------- 1.952. ------- 1.949
5. 1.750-1.751.---------- 1.749 ------- 1.7475

The bearing size listed is nominal bearing size, I could not measure mine
Runout was less that .0005 on center journal

2 is .0035 bigger and 4 is .0030 bigger. You’d have .0005-.0015 on 2 and .0010-.0020 on 4. The cam might not fit if you are on the minimum on some of those holes. And .0005-.0015 on 1.

Most of the time it’s the block Thats not straight and round and not the cam. Without measuring every cam bearing you don’t really know what your clearance is.

If you have an old cam core there you don’t care about, grind it to a tool and stick it in the block. Then turn it to clearance the bearings.

That’s the easiest, best, fastest and cheapest fix there is. I’d be more inclined to think the issue is the block.

Big block Fords are notorious for jacked up cam tunnels. I’ve had several that the cam supposedly slid right in but once they got some heat in them the cam would grab the bearing hard enough to snap the pin off the cam and if you are unlucky you bent some valves.