Does it run OK?
Does the exhaust smell? fuel smell or hot lean smell? you will know the difference.....
Does it surge when driving steady?
Do you have to really step into it to climb a hill?
Hows the fuel mileage?
Hows it start?
Hows it smell a few minutes after shutting it off hot?
And last question, why do you think it's lean?
I run a wideband air/fuel ratio gauge on my truck with a 250 cubic inline six. Mine runs best at 15.5 -16.0 to 1 air fuel ratio, this sounds lean when you hear people talk about A/F ratio's because most only understand WOT for racing. If it runs well, leave it alone for a while and see how it looks after a couple hundred miles. Watch the oil for fuel smells, tail pipe soot, plug color, and most of all, fuel mileage.
When I was working on Rochester Model H, Corvair carburetors, ( three at once ) I would solder the jets shut, then drill out to the size I wanted to try. If it worked, I purchased the correct factor jet, if it needed more, it was no problem to drill a little more solder out.
