The S10 T5 is only 1/2" longer than a "normal" manual tranny. You really only need to take about 3/8-1/2" off the tip of the input shaft. Shorten the collar to the same dimensions as the old 3spd or whatever it is your replacing. Bolt holes in the tranny will need a 1/2" drill bit run through them also.
The tilted bellhousing is from a Camaro. Unless you're building an '83-up Camaro, don't bother with this one.
What bellhousing to use depends on what size flywheel you are going to use, and what fork angle you want to use. You also need to be aware of the center hole diameter.
For the small flyweel, the most common is a 403 bellhousing. This would have the 4 11/16" center hole and a horizontal clutch fork. There are other choices as well. I can get into those if necessary.
The 153 tooth flywheels use a 10 1/2" clutch. I have not found an application for a 10 1/2" 14 spline clutch disc, but you can get them custom made for about the same price as one over the counter. Look at our "tech tips" section on the left sidebar for more info.
