It's a early 75 cvcc engine witht he funky head. You can still get a header for them on Ebay every so often. (becasue they DON'T FIT the other ones, and over the years the parts stores that haven't sold them to ignorant customers, have liquidated them to OTHER parts stores for a "deal")
That head/block is an animal to itself. The bolt pattern for the head is off just enough that they aren't interchangeable with other cvcc's. The intake side, there are two headbolts that are more inward to the cam just enough to not fit with other cvcc heads/maniflolds. SORRY..
Back in the day, I had a machine shop egg-shape (well, that's what I ASKED FOR) those two holes to use a double-dual EM-1 head (since I had ported it already) came back to pickup and he drilled out the hole larger all-round INSTEAD of doing what I wanted and cut thru the aluminum and into a water passage.
! Then I had a BRAND NEW JUNK HEAD
You're gonna have a heck of a time finding an intake to fit also..
I wonder if you could take the block to a "good" machine shop and ask them about boring those two holes out, and heili-coil them back to the right pattern of the ED-3/4's..?
NOW, on the other hand.. You picked up some R A R E parts there.. Lets see some pics PLEASE!!!