Yes the Demon could be ordered with either the 198 and 225/6 or the 318 or check off the kill square and get a 340. Mine originally was a 198 and there are several swap kits out there to go to a 383, 400 or 440. The 340 order came with an 8 3/4" rear and 727 tranny whereas the slants and 318 could have been the 7 1/4" or 8 1/4" rears and 904 tranny (I think you could get the 727 with the 318 but not sure). There was also 2 instrument panels available for the 340, either the standard square speedo one or the round Rallye one.