Re: dwell verses feeler guage merc 140 hp
I have a 86 4 banger also. The point is a 22 year old motor might not be setup to run as a brand new motor. Parts wear just a little i would think.
In my own inexpert opinion each motor is different, right after they leave the factory. No 2 will run the same.
Get yours to run as best as you can.
Go out and enjoy it. Good luck