help identifying this lawnboy?

ignore the engine as i had to swap it due to the old one being unable to fire on good gas start fluid good coil and idk how the compression was. what is the value of this also? if possible lease help identify the DECK not the motor as the old engines label was rotted off.
The first pic is the finished engine swap. the second is the engine that was swapped onto the deck in the first pic. identify the possible model # of the first pic.

I can't tell if this applies to your mower but on some later F-Series LBs there's a large piece of sheet metal across the top of the handle. The model number is on the underside of that piece.