A833 18 spline 4 speed crash box.

I drove a slick shift 3.09 first gear 833 for quite a few years on the street. Until I put a DR-4 wide gear Jerico face plated trans. in my Dart about 10 years ago. You just have to float them through the gears like a semi truck or do the double clutch shift.
Before you take your synchro trans. out go out and drive it around for a few weeks, and just use the clutch to take off with. It shouldn't take to long be for you figure out how much you have to back off the throttle to up shift smoothly, and how much throttle to give it for the down shift, with no grinding or clashing of the gears. Start out shifting at a low RPM's ( under 2000) and up the RPM's as you get use to it, It's all about road speed and RPM.
When you put the slick shifted trans in start out double clutching each gear shift and ease your self into floating the shifts with road speed and RPM.