Ask whoever you're going to have do the work how "they" want it measured. Different places and different people prefer different ways to get the length desired.
I've got to say the word "different" one more time.
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'58 SWB Fleetside...Front & Rear Porterbuilt Dropmember, 6.0 LS /4L60E. Accuair E-level, 20 Billet Specialties (Vintecs)
'63 Buick Riviera ... AccuAir E-level, 20" Billet Specialties (Vintecs)
http://67-72chevytrucks.com/vboard/s...=528853&page=5