Pilot bushing for 4 speed swap

Make sure it hasn't been chopped off already. Seems pretty common these days.

I would figure depths as such.......
.650" for the converter or bearing depth
plus
1.000" for bushing depth
plus
.500" for the input shaft nose tip
So about 2.150" total.

Some rough numbers I came up with from a 440 crank some time ago. The diameters aren't exact but the depths were measured with a depth mic..........
CrankDepthDiam.jpg

IMO, if you use the bearing instead of the bushing you may want to consider indicating that bell housing in as close as possible.