Howie - thanks. All tips are noted and if I remember, followed. What is obvious to you guys is a mind blowing revelation to me.
Spent more time than it should have taken measuring the pushrods. I eventually torqued down the T&D rockers to about 35 lbs, backed the adjusting screw all the way out, put in the measuring rod, turned out the thread till it was snug, released the rocker nuts until I could slip the rod out, and measured it with my new 12 inch vernier calipers.
Checking the four corners my heights are between 8.726 inches and 8.745. I didn't check the position of the rocker tip because everything I read and saw suggested that the Comp Cams 7902 measuring rod wouldn't stand up to the pressure of the spring and I don't have any light springs.
Now I'm pretty sure I have the lengths I was thinking of putting the rod back in tomorrow and testing the roller position. It may collapse the rod, but I don't need it now.
I'm waiting for Barry to give me direction on the length of rod to order, and any specifics I need with the roller rocker and hydraulic roller lifters. Feel free to chime in.