3 Speed Transmission

[speednmark]

Allright so i sent my 1970 Chevrolet C/10 with the stock 3 speed into AAMCO on burnet in austin texas today. tranny locked up on me while out at a car show last weekend couldnt even press the clutch to the floor, it was like pressing up against a brick wall. Not sure if it was the throw out bearing or if my gears are blocking the clutch, im no tranny professional so i wont try and diagnose my problem. My question is while im having it rebuilt, which is what i should have done right....i wanted a performance clutch, one of the cavilar coated clutch kits installed, ive heard they can stand things like dumping the clutch more so than a stock clutch can. whats the benefits of having a performance clutch and having this tranny that hasnt been rebuilt in 36 years rebuilt the thing i need to be doing?? thanks