Identifying Gen III Hemi - 6.4L

Exactly right. Car 392 block is orange and truck block is black. Color is one of the more obvious. However, look for the car to have a forward facing (angled toward the left) throttle body while the truck throttle body faces upward at the front.

Additionally, look for a 6.4 cast into the car block and the truck block will have a BGE (Big Gas Engine) cast into it. The BGE is your best bet for a high horsepower engine build, especially under boost or nitrous. The BGE is the same block and head castings as the 6.2 Hellcat engine. (They both have a 4.090 bore but the HC uses slightly shorter stroke.)