Is the MI frame still in good shape? Between the 4-cyl and 6 you have differences underneath... tranny xmember, gas tank, motor mounts, leaf vs. coil rear axle. Better off swapping the CA body over if you can. All the interior parts from the V6 should install fine (mainly the dash and gauges to match the V6 wiring harness, etc.)

Big Truck: 00, 3.5, Endeavor, 5-Spd drive line in hand!
Little Truck: 87, 2.6T I/C, MT, LSDs, Tonneau Top
Her Truck: 03, 3.8, 20th Anniv, 65k
Daughter's: 06 Eclipse, Keeping it Mitsu!
FSMs: MitsubishiLinks.com