Flat head question (sorry)

Depends on what motor it is, how much it bored, stroked etc.
Not enough info.
Off the wall guess 275 HP

The flat head 4cyl 134 in my willys had 60 hp stock with 6.8 compression.
I bored it .080 over milled the the head to where it has .029 between the valves and the heads without gasket.
Running a .070 head gasket I have 8.4 compression with 150 psi cranking compression.
How much HP, I don't know but I bet it is more than 60.