checking pushrod length

I'm building a 360 with stock bottom end, Hughes whiplash hydraulic cam with sidewinder aluminum heads.. fel pro 1008 head gasket(0.039 thickness).. i have stock stamped rockers or a choice of 273 adjustable rockers.. i need to find correct pushrod height as I'm unsure if stock pushrods will work anymore... I'm new to this and i haven't really messed with adjustable rockers much.. i have both comp adjustable push rod checkers...ball to ball and cup to ball from 6.800-7.800 length... any tips or tricks to make sure i do this correctly? aluminum1.jpg aluminum2.jpg