Thanks John, I have come across some of your post in searching.

So is one VB considered better then the other? Primarily trying to understand why the 2466886 transfer plate for the hemi/HP V8, and also I have seen VB upper bodies with cast #2801856 in the 67-68 years, and 2892348 in the late 68-69. Some have the hemi 886 transfer plate, and others the low performance 2801295 plate. So I guess is the pressure relief ball and spring a benefit for the 69 up VB?