I have had good service with Ward's
http://www.wardsclassiccarradiorepair.com/
Did a great job on my '67 GTO AM-FM radio.
Even though he specializes in Mopar radios, he also does most Delco radios.
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1967 Pontiac GTO
1965 Olds Cutlass
2014 Ford Mustang
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GTO-The Great One for 1967
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