Originally posted by jmd
One sure fire way is to use the aftermarket T56, a Lakewood (which has BOP and also Chevy pattern; you just need to pick whether you want hydraulic or mechanical)... The aftermarket T56 bolts to a T5 bellhousing (which the Lakewood is also drilled for) and is overall, a bit longer.
This is certainly not the only option.
I have done a hydraulic clutch T5, and I recently went to mechanical. No biggie. They just weren't behind Buicks, but all I'd have to change to do that would be the bellhousing.
Matthew