small block pushrods for adj rockers & rocker saft hold down blocks

My apologies for the lack of information.

The 318 has 86-69 heads which were milled 0.020 and will have a CC XE268H cam with generic Summit hydraulic lifters.
Trying to take advantage of a set of Proform alum 1.5 roller rockers I picked up in a deal and was hoping to find a good set of 5/16 A-C cup pushrods.

My understanding is stock pushrod length is 7.33" and adjustable rockers with hydraulic lifters = 7.25" and I assume w/ the 0.020 head mill I would need in the range of 7.23" - can someone confirm?

It sounds like I should order push rod length checker.