They were done by Larry Widmer of Endyn Inc., and came with their highly modified Edelbrock Scorpion intake as a matched set.
The hi-port iron heads and intake all have the Endyn logo, the date 10/82 and the word "ATLANTA" stamped on them.
The "Soft Heads" article, and some amazing info on the Boss 429 can also be seen on the Energy Dynamics (Endyn) website in the archives section.
I can take some photos to post if anyone would like to see them.
Analog Dan

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