HELP ME OUT A BODY GUYS

As you all know I have a 71 demon for sale posted on here & some other sites. On another site there is a guy crying foul & he says I am a scammer. He says that the dodge demon only came with a 340. Now I have been around these cars for awhile now & unless im going crazy, getting older or out of touch. I swear Ive seen demons with 318s & 6cyls. The vin on my demon & the drivers door sticker & the title says its a 318 car. AM I WRONG ?