how the heck can you tell from those pictures?
you need to get the crud out of there..
and show a picture of the bowl and or guide..
looks from the tiny bit i can see that .
there is porting on the pushrod pinch..and porting around the roof/guide..but its hard to tell..for sure..
pop a keeper off and pull a valve...

i will say this much the motor they came off of..
either had no ring seal..or the carb was missing a bunch of screws...that thing is carbon rich..
or maybe they ran it on diesel fuel.?
cheapst.