DUSTER 318 VS CUDA 340 clone

I am here in Toronto and check the listing many times a day. 74/75 Dusters with that combo sell here for 7 to 9 grand from what I have seen.
A dealer near me has a 1973 PLYMOUTH DUSTER 97644 km, Nice, 340 gas, 4 spd, std, red on black vinyl, he is asking $12,000...and that is a dealer.
Keep your cuda, just my .02
AL