Comp Cams Xtreme Energy 268 ?s

My '71 Dart GT's engine is the original 120,000 mile 318. It is currently in the shop, for what I was thinking was, a stock rebuild. The engine builder offered me the cam/lifters that came out of a 273.
Will also need the pushrods and rocker set.

from Factory V-8 Engine and Cam Specs by Year 1965-1975
All Chrysler degrees so they are comparible to each other.
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Keep in mind the mechanical valve lash when comparing with the hydraulic