I only have HO 4.0L & 258ci flexplates, both measure ~2.695" I.D., they are a "stamped tang" style hub-hole....not the easiest to get a precise dimension on. The bolt pattern is on a 3.75" circle, the bolt holes do not appear to have any shifted away from the 60°-on-center, the bolt hole diameters are .547"(4.0L) & .532"(258ci). As far as crank flange to ring gear & friction face offset/spacing is concerned, can't help with that, need an actual flywheel in You hands for that.