Yes need to use light checking springs and I'd suggest a pair of old hyd lifters w the cup epoxied to the top of it's travel. Solids have a deeper "cup" but to measure V/P clearance due to the "lift", measuring it w the diff cup depth may actually b OK & the same in effect as measuring it w a diff length pushrod but the diff "cup" depth MAY or may not affect the wipe pattern (I'm not sure) if you checked that also so short version I'd use an epoxied hyd & then you'd b good on everything unless someone chimes in that the diff cup depth does not affect your outcome.