'69 Barracuda T56 swap, floor, cross member
Ordered .014 offset dowels and positioned them at 4 o'clock or 5 o'clock or so position and was not not able to get runout within specs (first picture). Went ahead and ordered .007 offset installed facing 4 o-clock or 5 o'clock or so position and bellhousing fell right into spec right away (second picture). Loosening bellhousing and then re-tightening would change it .001 or so. So it seems to hold the tolerances fairly well.
Also, for final check I ran a bolt out of flywheel so magnetic base would ride closer to center of flywheel as Silver Sport recommends.
Anyway, can now proceed forward with getting engine/k-frame/trans into car.