I'm not sure if I want a radial...so many awesome choices. I can't decide!
* Moki 400 in a P-47
*
Several Moki 400s in a giant B-17/24/29
* OS IL-300 in a Tiger Moth or similar
* Kolm 4-pot in a Mustang
Seriously just listen it sounds orgasmic
* Stinger 609 in a Baja 5B buggy
* OS FF-320 Pegasus in a Cub or Cessna