I don't see a point in a TBS. The Hemi's throttle body allows air into the intake manifold, where the vortex would be if a TBS was installed. However, fuel injection isn't happening there. There a 8 ducts from that manifold, one to each cylinder. The injectors are inserted right at the juncture of the manifold duct and the cylinder head. Fuel's mixed in just barely in front of the cylinder, not near where the TBS is generating its vortex. Hence, the TBS isn't going to have any effect on fuel vaporization.