I second the vacuum advance. My car was running exactly like that and a new canister fixed it. About 20 bucks at Discount Auto Parts and about 20 minutes to replace.
Gotta love old cars for cheap parts...
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65 convertible, bench seat, '66 289 Hi Po motor, 351 heads, headers, duals, shelby intake, petronix,
4 speed top loader, 389 rear, road demon
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