Yeap, I talked to Larry today (very nice). He told me that those 73 resonators have been impossible to find since early eighties. He also said he's done repro system for 74 sd cars but years ago.
Looks like some good Pontiac shows (for Wisconsin) down his way:
1) Don Miller 23rd Annual all Pontiac show June 11th
2) 26th Annual Foster all Pontiac show on August 13th
Better mark your calanders !
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