The metering lever, at rest, is designed to be parallel to the machined face of the carb, where the metering diaphragm sits.
On a four stroke engine, induction is caused by piston descent alone - however on a two stroke engine crankcase pressure can be used to help fuel pumping....Inducted fuel passes into the crankcase before being transferred above the piston where it is fired.
You may find that any grooves are there to allow carburettor breathing in your situation.
In either case, study any drillings on the inlet manifold and mating carburettor face, and refer to the truth marks on the original gaskets to make sure everything is in the correct order.....it’s really all you can do.
John
On a four stroke engine, induction is caused by piston descent alone - however on a two stroke engine crankcase pressure can be used to help fuel pumping....Inducted fuel passes into the crankcase before being transferred above the piston where it is fired.
You may find that any grooves are there to allow carburettor breathing in your situation.
In either case, study any drillings on the inlet manifold and mating carburettor face, and refer to the truth marks on the original gaskets to make sure everything is in the correct order.....it’s really all you can do.
John