7060 Intake gasket?

My black belly 7060  had been setting a LONG time before I bought it. The motor was fairly freshly rebuilt, but had one bad sleeve and piston, which I replaced.  I also had to put a new/rebuilt injection pump on.  It starts quick and easy and runs great, but when pulling even a marginal load (yesterday it 80 degrees or so and I was pulling an 18' 2300 finish disc), it gets too hot (220). I have flushed the radiator, fan belts are tight, foam around the radiator is good, air filters are clean, etc.  The fuel was old and gunky when I got it, and have flushed the tanks and put 2 filters on before it gets to the pump, and both of them still look fine.  I put the intercooler and gasket on by myself (without a lift) when I was going through the motor, and I have always worried I pinched the gasket or perhaps didnt get it seated right.  Could that be causing my heat problems?  Any other suggestions?  I had my 7045 working the same day, pulling a 37' Unverferth rolling basket in a higher gear, and it didnt get over 200.  Any suggestions or troubleshooting ideas for the intake gasket would be appreciated. 

I second the radiator internal cleaning.  Did that to our 7040 to cure the overheating problem.

Before doing the radiator, verify the temp is actually hot by installing a manual temp gauge like a D17 style. You can purchase a cheap gauge and wire it to the outside of the cab to watch and make sure you really do have an overheating condition. Compare it to the factory gauge as there will be an extra acces plug on the thermostat housing. Many dashboard gauges read high when they get old and there isn't a problem with the engine....it's the gauge or sender.

A blown/leaking intake gasket would cause more exhaust smoke, low HP and low boost pressures.

Put the tractor in "Park" and operate at full throttle for about 15 minutes. (if it's  Power Shift put it in 6th gear). After that warm-up period the temp gauge should read 180 degrees....that is what good thermostats should do. If this is good and the temps just steadily climb when working the tractor (say like over a period of 10 to 30 minutes) and the harder you pull it the hotter and quicker to hot it gets, it sounds like too small of radiator, or in your case plugged tubes not allowing good coolant flow or fins plugged badly inside the core. Be sure the transmission isn't over full by any amount as that adds to the cooling package heat rejection load. The fan should be 8 blades and the shroud should be covering 1/2 of the blade tips for best air movement.

what kind of gauge is it? I have bought some from oreilly sunpro? can't remember right now for sure the brand, but they always read 220*. before you tear the whole thing down, you still need to verify it is getting hot, and not just a false reading. Don't ask how I know this! LOL! Ed.

The gauge is a laser, google harbor tool and enter Cen-Teck 96451, I checked my 8070 gauge with  a 180 thermostat and when i checked the thermostat housing it read pretty close to 180 deg. within 5 degrees. then i checked the radiator at different places, could tell the difference from inlet to outlet of radiator.