I'm new to this forum and would like some info. I've got a 73 mach 1 with the 351 Q code engine. It's untouched except for electronic egnition and a 750 holly 4 barrel. What I would like to know is what octane do you guys feel this engine was ran on back in the day and which do you feel it should run on today? Also, if it matters, in it I have a 1971 C-6 special that backed up the 429 from the factory and 3.70 posi in the rear.
Thanks & have a good one.