I think the major parts on this engine are small block Chevy. The heads are right for the headers, so they must be Chevy as well. The valve covers have perimeter bolts so they are likely Chevy. Just so you guys know, exhaust port spacing on early engines are as follows. Chevy small blocks are 1-2-1, big blocks are 1-1-1-1 except W blocks, Buick’s are 2-0-2, Fords big and small blocks are 1-1-1-1, Oldsmobile, and Pontiac, Studebaker, and Packard are 1-1-1 with a joined center port.
I still love the build, you just have to put a bow tie on it.
Olderndirt