BGE block is used in hellcats and 6.4 trucks only, it is the best production block. Not very far behind is the car 6.4 block.

The BGE has its own heads, the best production ones for NA engines. You can use the car 6.4 cam for a nice bump in HP but you will still have less compression than the car 6.4 and will probably be fine to run whatever gasoline you wish, even 85 octane should be fine with the big cam and lower compression.

Supposedly the truck has a better intake than the car because of hood height restrictions, I still have yet to see a direct test between the two either on the dyno or track.

Bottom line put a good dual exhaust on it and the car/apache/SRT 6.4 cam ($68 from the dealer last one I bought) and it should be very close in power to the car 6.4.