The Hurst "Super Shifter" is a an H pattern shifter with reverse lockout. Although mine is on the L bracket and has longer rods that requires cutting the tunnel I see no reason it can't be bolted to the trans like a stock shifter and use shorter rods.
I just used RH threads. Set it on the bench, and forget about it. IF I needed to make an adjustment, just loosen up one side of it, and turn it a turn or so, but it has been rock steady since being installed. I just bought heim joints on eBay, and went from there.
Using all RH threads you're "lucky" if you get the adjustment bang on (but close is probably good enough). With LH and RH threads the adjustment is infinite whereas with only RH threads adjustment is limited to the width of a thread
