Carroll definitely had strong input on the Dodges. I was there.
+1 he was there (Whittier) nearly every day having fun being Chrysler's skunk works. I remember when Hot Rod got hate mail when a GLH-S beat a well prepped GT350 at Willow. CS was somewhat upset and sent Rick Titus to Willow at the next Cobra event to back up the earlier results in public. He did mention that he had added another 20-30 hp to the car we took.
I took the wife's Plymouth minivan there when we shot a cover for Mustang Illustrated - Carroll looked at it an said those wheels have the wrong offset - they were off a Motor Trend project car that went to the crusher (with my van wheels). He pointed at a stack of BBS wheels with new Gatorbacks and said take those they have the right offset. I never could understand how he kept so many details about different projects straight in his head.