What made the Scamp / Swingers special

Could you get the 340 in a base car Plymouth and Dodge?
Sounds like you could get just about anything you were willing to pay for. My Scamp came with (all factory ) 318 auto, ten inch drums, bench seat, AC, radio, PS PB, 8 3/4 rear no sure grip, vinyl top, standard guages, small wheels with full cover hubcaps. Pretty interesting order, I wish I could see how that happened, did someone order that or did the dealer throw a few goodies at it for a premium?