I've been slowly working out the bugs in my 70 Runner. It's got a 440 that supposed to be mostly stock except for a 509 cam. I didn't build the car or engine-I'm just cleaning up all the messes left by the last guy. It runs hot and I've burped the system, verified (and reset) timing, replaced the fixed fan with a clutch/fan setup, installed a 180 thermostat (ran hot), pulled the thermostat and ran it (still ran hot). I pulled the 974 radiator and had it checked by the local radiator shop. They said it had recently been recored and flowed just fine. The water pump is fine. I'm guessing that the 26" 2 core 974 radiator (from a 340 6 pak E body) is just too small for the 440??? I figured that since it was a 26" radiator it would cool ok, but I guess not???? any guidance? Thanks