I would weld the inside, the geometry of factory Chrysler distributors is such that the outside of the travel combined with a heavy spring helps get a very slow progressive curve, which is actually what you want (1-2 degrees / 1000 RPM).

If you're going to set it all in at 2000 or 2500 it won't really matter much though. But still will pre-load a super light spring (like the Mr Gasket/Trans Dapt/Mopar springs which are all the same) more to keep you steadier at idle.

And if you do a bad job welding and it falls out you won't end up with too much advance.

Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street