Felpro make gaskets for the sidevalve V8. Head gaskets (2 req'd): P/N 7548, Intake manifold gasket P/N LB 2853, or it might just be easier to buy a complete set of engine gaskets: part number FS 7548 B.
Victor also make gaskets for this engine and so do Monotorque. Felpro is probably the most widely available and if your local parts store can't order it in, there plenty of Flathead Ford parts suppliers who do mail order.
For other up to date parts numbers, see
modern CMP part numbers