7.2L (440ci) GM big block, same as the Charger six pack I think, comes with a riser, air scoop, edelbrock carb and two inlet manifolds
415bhp at 4700 rpm and 480ft/lbs at 3500rpm so plenty of torque but I'd probably put in a cam thats better at low revs
Now considering the Rover 3.5 is
169 hp at 5,200 rpm and 210 lb/ft at 2,600 rpm the big block blows it out the water!
not at all Doc 1 is GM and the other is MOPAR/chyrsler no parts are interchangeable
Charger had several six pack options, a 340cid, 383,426,and 440
chevy big blocks was 396, 427, and 454