Walk me through measuring pushrod length. I have a Sb 408 with a UD/Lunati small base circle hydraulic roller cam using Crane roller lifters and comp rockers. It has Dart Pro1 heads and a stock deck height.

I have an adjustable push rod and can I use just the inner spring to check the rocker agle while at max lift?

http://www.holley.com/HiOctn/TechServ/TechInfo/IECVTTech1.html
link to lunati's web site for checking pushrod length

Don't have the solid roller lifter to use and it would be different in height than the hydraulic roller. But I think I have the push rod leaving the described mark now how do I measure it accurately?

Rob,
There is no way to do it accurately with out either disassembling one of your hydraulic rollers and stacking washers in it to simulate a pumped up lifter OR remove a valve spring and use a light checking spring that will not collapse the hydraulic lifter. Only way to do it "correctly" period. No shortcuts :(

For an interesting treatise on valve train geometry:

http://www.mid-lift.com/

Go to a well stocked hardware store and find a light spring. A friend and I just went to a True Value and found a nice set of checking springs ( p/v clearance in this case).