Block ID?

Impressive that you can spot a '69 manifold from the pics that I took. I have no clue, honestly, what it is.

I found out that three of my pushrods had popped off their rockers so I put them back on tonight and installed some spare old tapered seat spark plugs from my '77 Firebird and the car is now running pretty well!

See the loose rockers where my fingers are... Whoever assembled this was a moron. I am bummed that it is not an original slant 6 but that is also good because I won't feel bad about replacing it in the future.