72 318 Scamp. Low oil pressure 1 minute after startup.

Thanks everyone once again for giving comments on this low oil pressure problem. I am learning so much listening to your information.
To answer some of your questions here is what I have found so far.
When I did the compression test they were all in the 120 to 125 psi range. I know this is a little low but from what I understand this is probably a 8 to 1 compression engine so maybe that is as good as it gets.
No 8 rocker arms not getting oil for fixed. I took off the whole passenger side rocker arm assembly and found a chunk of silicone jammed in the shaft. I cleaned it out with brake cleaner and compressed air. Now #8 rocker arms are getting lots of oil.
Ths timing chain is double roller and looks almost new.
Those pieces of old valve seals were not in the oil pump. I heard rattling and they fell out of the oil pickup screen. Which is bad enough.
There are fairly new brass freeze plugs installed and none are leaking.

Tomorrow I m taking the engine down to a bare block. Will look at everything.
I will post results tomorrow.