Jon
you are correct it is a zenith carb. , but there is no tag on it( darn it)
the base has a number 2-82
I will try to attach some photos of it.
Also there are numbers on the block of the motor. from the transmission end of block working my way towards the fan
F245AGC A m 16 x
As I said before the plate below the oil filter is totally rusted and I tried to wire brush it with a soft wire brush but I could not recognize anything at all on it.