I looked into this a few years ago and decided to go with a 4 speed and change tires and gears but this info may help you from an old post.,Found 3 ways to adapt the S10 t5 to the sixes now, after a visit to a shop in Denver that gave me these measurements, trim .56" (9/16) from the input shaft and 1.31" (1 5/16) from the bearing retainer and trim .25 (1/4) of the transmission side of the clutch hub (Vega) to stop any binding problems. The second method is to make a 9/16" adaptor plate between the trans and bellhousing, instead of trimming input shaft, and the third way is to get the Advance Adaptors kit to mount a V8 in a S10 which will give you a hydraulic clutch, bellhousing and clutch (part #712547) but will require you to change flywheels to use a 10.5" clutch. (in the $500-$600 range)
