Need help with a cam selection for swap

if you want sound get a Thumpr, if you want max power then don't. A Muthr Thumpr would work with your stall and has an rpm range of 2,200-6,100 rpm. Since its a toy and you're not really opting for the "best" choice but rather the one with the most radical idle I don't see a problem with going this route. A lot of people will say don't get a Thumpr because they're designed for sound and not performance. But it sounds like that's pretty much what you want lol