I know when I purchased the whole schebang that it was from a truck BB but my poor record keeping continues to bite me in the ass!. Another issue is I have a complete 400 (had a 727 behind it) but it does not look like there is a drilled hole with the bushing for the input shaft to center in. there is the big register cavity then a smaller "dimple" (like it was drilled with a big drill bit) so that eng will not work as is. Alright we're agreed with it being a neutral balance wheel & aside from the pilot issue if I end up with a cast crank 440 what will I need to do (if anything) to make the balance right? (is a cast crank BB an external balance?) & needs a special wheel?