Welcome you lucky guy. As part of new hobby I am building a library based on Mopar products and their history. If you have specific questions about your Challenger please ask away. If you like, provide the VIN and I'll provide all the details behind it.
As an example for your car there were only three engines available for the 1973 and 74 Challenger. The six cylinder was dropped and the V-8 choices were limited to the LA Series-based economy 318 two-barrel, the high performance 340 four barrel V-8 in 1973 and the 360 four barrel V-8 in the 1974.
