I have a Mopar crate 360 in a '71 Challenger and am experiencing some rattling at high RPM's and ticking at idle after the engine is warm. I've had a couple of locals advise me to boost the fuel and use a lead substitute. I only had the car 2 months and only put in regular 87 octane. I'm curious what octane you run, if you add octane boost and/or lead substitute. Thanks for the responses.
