Going to a C6 from a three on the tree and my torque converter supplier, Hughes Performance, tells me I need to know the pilot hole depth before I order a TC.  I think I know there was a 1.875 and a 1.375 pilot bushing used, as well. Any way to figure out what I've got without pulling the transmission?  '63 390 4V.
The engine is stock but will get a 5 psi Hampton blower for about 100 extra HP.  No cam as yet, this is just for show.  Hughes tells me I should go with a 2500 stall.  How's that going to work as a daily driver?  Show car, not interested in how fast she'll go.
Thanks!