You probably don't need roller stuff for that ET. What year is the trans? A late '70s-early '80s lockup unit is probably not where you want to start because the lockup parts are different than the non. You can try to piece together a "999" but the specific parts that make one up are hard to find. There were only three instances of them before the 904s became lockups.
For parts, I use A&A in Indiana. They have everything you need including "race-prepped" cases which are nice. Basically you'll want 5-6 front clutch discs, (depending on what drums you have) a billet spring retainer thing, billet accumulator, 4.2 lever, the good wide bands and a manual valve body.
For more staring line ratio you can look into a low gear planetary set but make sure you get the sun shell and all the washers and hardware that go with it.
There's really not much to them, just use good parts and it should be fine. They are generally worth .100" in the 1/4 mile vs. a 727.