Yes, HEI is "plug&play" IF you can find a unit with a similar ignition curve as your unitized unit.
F.e. the 1975 400 4bbl A/T #112948 HEI is close to the #1112127 "Unitized" distributor.
HTH
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1966 GTO Tri-Power
1970 GTO TheJudge
http://www.poci.org/
http://gtoaa.org/
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