Little bit about the car:

97 Z28 A4 with just about 76K on it, driven maybe 500 miles a year or so.

Mods - Pacesetter Long Tubes, ORY-Pipe with a dump before the axle, cat delete and no muffler, 373 MOTIVE orange gears, Richmond MEGA rebuild kit, TorqHead 24X swap, lingenfelter supertube cold air intake, TB bypass, SLP airfoil, entire car is adjustable UMi suspension either Poly/Rotor or Delrin/Rod (K-member, Sways, everything), Bilstein shocks, Koni Springs, Slotted rotors by RotorWorks aka Brake Motive aka Power Stop, HAWKS HPS front and rear pads. New inner and outer tie rods as well.

Still have the original 60E that won't be built for a while atleast same with the rear end. I will be going with a Tru-Cool 40K trans cooler as well. Anything else I would need?

What stall do I go with?

Forever I've had my mind set on a YANK SS3600 single disc. Is there any benefit to going triple billet disc?

Future Plans - Minimum of LE stage 2 heads and custom cam, Probable - AFR heads and custom cam (want close to 400 rwhp). Eventual goal just a 383 stroker with large heads and cam.

 

only benefit to triple disk is if you want to lock the converter at WOT. probably not needed for you at all

4000 stall would be the minimum I would go to on any 4l60e camaro that wants to be raced...based on only 500 miles a year...I'm gonna say you fall into that boat.

 

^^^.
As stated, triple disc for locking the convertor at WOT as on a dyno.
Since you have 3.73s', yep SS4000 ( SS3600 minimum ). A SS400 will help with idle and low rpm if you would go to an extremely radical cam.

 

Given it's a lt1 I'd choose a 3200 to 3600.

 

If your thinking of the 3600 go with the 4000. I should’ve from the start!

 

If you plan to stay n/a for a while and you mainly race it(500mi/yr im guessing its mainly a race car) then i would go with a 4000 like our 4000 hard hit. This will be very aggressive off the line and give the best track performance for a car such as yours.