I put a 6.1 into a 73 D100..
IGNITION: FAST
FUEL: Aeromotive
THROTTLE BODY: SLP
HEADERS: SLightly modified SRT Grand Cherokee (There are some places making exact fit ones for cars now)
MOTOR MOUNT: E-bag....But for you I think there are people making them for cars.
TRANSMISSION: 727 with a Mopar flex Plate
(Dont waste your money on that stupid no functioning spacer kit that XV sells!!!!! JUNK)
CONVERTER: 10" TCI 3800 stall that had HUNDREDS of passes in my old cuda

Fun to drive
Went 12.20, dont remember the MPH but it weighed 3600 WIthout the tail gate...

V10