Cutting A833 Input Shaft Question

E Satterfield said
My main concern is enough material remaining on the shaft that it doesn’t force the taper into the bearing. Naturally the further back the input shaft has to be cut the further towards the splines and taper the pilot is going to ride. If the measurements were 1/ 2to 3/4 needed cut I would not be concerned . The engine is this car was built by a shop in Colorado and dyno tuned before it went into the car. I’m not touching it if I don’t have to as it’s been as close to perfection as I could expect

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Regardless of where you cut it, the distance the to the splines the bearing rides is not going to change. The face of the trans to the roller bearing in the crank is a fixed distance of 6.525" regardless of input shaft length. You are cutting off excess input shaft length that would protrude beyond the roller bearing into the crank, not the part between the bearing and the trans.