You said you didn't have any timing marks on the new gear. I'd urge you taking a second look for the two punch marks only becaue I had one that ws vry clearly marked. Another one I worked with it didn't seem they put a whole lot of gumption into hittin' the punch and it wasn't easy to see. It might also be worth a look at the back (distributor) side of the gear. If you find a single punch mark there, you likely got a gear for a Cub, and I have no idea whether you could make it work or not.
If they just aren't there, but the gear seems to mesh okay with the cam gear, I'd go at it like this. With the governor gear OUT -- Mark the position of the #1 plug wire on the body of your mag or distributor, pull the cap off, and turn the rotor so that the button points to that mark. On a distributor you can probably do this by turning the button. On a mag you may have to do it from the drive end, turning clockwise.
Bring the motor around to TDC on #1 compression stroke. You should be able to make out the punch marks on the cam gear at this point. Make sure your rotor button is pointing to the mark you made for the #1 firing position, and use the drive lug at the front end as a guide to insert the governor gear so that the notch on back of it meshes with the drive lug. This should get your valve and ignition timing in synch close enough that you can then proceed with the usual drill for timing the mag or distributor.
Just double check before putting thinigs back together that the motor is still at TDC and the rotor button pointing to #1.
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