The mvvs 160 glow is viable for f3a---esp. if pumped---the one in the pic has an OS pump inthe back + an OS carb---but the MV carb is so-so OK as well.
The early mv 160 glows were hampered by the original needle-roller rear bearing, but now they've gone back to a "normal" one they're OK.
The one in the pic (now in a Tunnel Vision profile) has been tried in my f3a models--it would do, but the OS160 is just overall better,IMO, so that's what I compete with.