It's a 1950 COE. Engine is a 261.
Finally found an internet pic (attached) of what I assume to be a typical COE layout. It appears I'll need both intake/exhaust manifolds.
Attachments

Matthew 6:33

1952 Chevy 1/2-ton 3100
Late '55 235/SM420/torque tube 3.55
Dalton Highway survivor (using original 216)
www.truckwithaheart.com