The 6 cylinder radiator wont match up... Trust me I tried while doing my engine rebuild swap... The good news is that most new 4cly radiators are now 4 core and have no cooling issues. I picked one up for about 150 bucks at auto parts store. I have a 10K winch in front of it and run my a/c constantly never moves past normal operating temps and I usually cruise in the 75 to 80 mph range. Just recently did an 900 mile roadtrip never had an issue.