I have a 58 biscayne with a 235. No mods to engine intenally. Only external mods I've done are pertronix and a pcv/road draft to manifold. Stock specs say .025. Is this ok to leave or do I need to gap it wider because of the dual carbs? The 2x1 is on the stock exhaust manifold and the carbs are rochesters. Thanks for any info