My 32 coupe has a 60 over 401/425 cammed nailhead in it. It’s not radical by any means but it’s not stock. Normally I run just the regular piss water gas and I like to add an octane booster when the need arises. Buying premium all the time gets expensive as well as it seems a waste for my driving purposes. My wife’s 40 pickup with hot V6 may need it more often than that once in the road. I had a couple cans of the Pennzoil 104 octane booster and that worked really well but I can’t seem to find that anymore. So - what do you guys use/recommend?