When you buy new shifter bushings from Bill be sure to spend the xtra $$$ and buy a set of beam plates.
Install them and carefully align your engine/transmission/rear end.
I'll bet dollars to donuts that the engine/tranny/rear end are not exactly where they are supposed to be and that's what's worn out your shifter bushing.
Here's a link to Johnny "Progs" write up on installing a Hurst shifter over on that "Other Forum" (that shall not be named, 'cuz they're azzhats).
It's gots lots of nice pictures that details all the necessary steps on getting your shifter out and back in.
I don't think that there's enough play in the shifter assembly to move it enough to get to the bushings.
http://forums.*************.com/show....php?t=1063558
You will notice that there's part of the link that's been deleted and replaced with asterics (*******).
It shouldn't be too difficult to figure out what goes in the place of the asterics.
It looks something like "chevetteforum". Get it?
Good luck!!
TomC