In addition to the tips Jerry has provided, did you set the ignition timing to factory specs? If so, those specs were established for ~65 octane gas. You can advance your timing a LOT and get a noticeable step up in power out of your 216. Set your timing to the fastest/smoothest idle when warm & lock it down then readjust your idle if necessary. Unless the starter drags or you get pinging under load you'll be set. If either of those occur you can back the timing off a tad until it goes away. For today's fuels you should be able to advance your timing at least 10 deg over specs.
Last edited by Tiny; 09/05/20217:53 PM.
Save a life, adopt a senior shelter pet. The three main causes of blindness: Cataracts, Politics, Religion. Name your dog Naked so you can walk Naked in the park.
