This has an f-head. It also has the same hydrovac brake booster as Patterson did (Mine still needs restoration).
https://www.facebook.com/marketplace/item/1489257335134188
“Project! Willys flat fender that my family bought in 1970. It was a daily driver until 1980 when the engine (not the original engine) was seized. It needs a new motor.It has sat on the side of the house since then. Pink slip/title in hand”