Just bought a 1981 camaro Z28 at auction with 400cu/400 HP small block
- Turbo 350 transmission
- Shift kit with 2500 stall
- 3.73 posi rear axle trying to find out cam size and any other info about the engine any suggestions? Thanks

 

If you don't have a build sheet from the engine builder, and don't have x-ray vision, then you're going to have to open up the engine to see what internal parts were used.
Absolutely no way of knowing what you have otherwise.