MSD ignition and timing

340 11.3 comp. M1 intake 750 holly,Factory 1970 iron head, home ported, it flowed 243 cfm intake, 2.05 intake valve, mopar 528 lift solid cam. This engine liked 36* no more no less. It also ran 11.60 in a 2900 lb duster. These numbers are never written in stone. Start at 32* and bump it up a notch at a time and see what works best for yours.