Thanks for the info Viking. The Block casting #'s, except for the 352 on the end have been scrubbed. There appears to have been a large free-hand capitol letter "A" dragged on the surface of the fly-wheel end of the block with a stick welder; across the 352. The weld mark is just enough to make a discernable mark on the block. The cast iron intake casting number is C6AE with 9425-G under it; with a large "S" casting in front of both of those #'s.

FFR428, I'll just have to show my ignorance here; what does "PI" mean??
I can see on the block where the other numbers were took off with a grinder but I think I can raise them, with a chemical trick or two, enough to read them anyway.
This weekend I'll pop the heads off and check for the solid lifters; then open up the bottom end and hopefully I will find some numbers on the crank.
Thanks for the help guys. Have a great week.