I have an off-road H pipe, so the cats aren’t an issue. For me 100 octane leaded gas is readily available, for about what 91 (all I can get here at the gas station) costs. Lead has lubrication factors, but I not old enough to remember it being in mogas.Your catalytic convertors cannot handle it. Your heads have hardened seats so you do not need lead additives. Besides poisoning the environment so we have an excuse for brain damaged leaders , what is your hoped for benefit?
I am (just) old enough to have run leaded in a while in a pre cat car. It likes the octane boost from ethanol mix better. And it did not show valve seat wear when it needed a high mileage rebuild, although it had the gunk in the pan. It got hardened valve seats anyway.