Measuring for pushrods.....how many cylinders do you check to get it right?

There are two separate builds going on here.
Mine is the stock stroke 1990 360 that came to me with 2 blown head gaskets. It is an iron head mill with #308 heads, Hughes 1.6 rockers and roller cam and an Air gap intake.
The other engine was an original MP Crate 360/380 that Rich is building into a 4 inch stroke 408. It has Trick Flow heads, PRW rockers and a Hughes cam.
I appreciate the responses.
My main question was if it was customary to measure for pushrods on more than one cylinder. Rich has been reading a 408 build in old Mopar Action magazines and in one issue, Ehrenberg measured just one cylinder and ordered his pushrods based on that one reading of 2 rocker arms. That is what I have done too but Rich and I got curious about why people often just checked one cam lobe when degreeing a cam and just one cylinder when determining pushrod length. I'm glad to hear that others had this same curiosity.