Overheating after 45min-1 hour of driving

15 is coolant temp sensor reading low temp. 45 is O2 sensor reading rich. Older GM vehicles do react to bad temp readings. I would replace it first. This can cause the rich condition for the O2 sensor.

The ports in the block could be cloged not letting the coolent flow completley threw and its getting to hot

A failed thermostat stuck closed will cause overheating. Test that item by boiling it. Nearly all car thermostats will have opened fully at 100 deg C. There may also be a number stamped on it to indicate its opening temp. You can keep track with a kitchen thermometer with a range above boiling.

A blown head gasket will often cause very quick overheating, and you may also see white bubbles like dry ice in the radiator neck. There is a simple test for combustion gases in the coolant, which any competent mech can do for you. The kit can also be bought from Autozone etc.

https://www.youtube.com/watch?v=a3J00_e7fyo

It is possible that the water pump has corroded away internally and is not circulating water, but if the car has always had antifreeze added, that should not happen. My Camry V6 water pump was still good after 220000 km. If you do get in there, replace the timing belt while you are at it.

A faulty temp sender in the block may also cause overheating, but only because it does not start the radiator fans when it should. You would notice if they were not running when the engine got really hot.

Tailpipe drips don't tell you much, as there is always moisture in the exhaust gas.

I'd look at a leaky head gasket, which causes persistent overheating. There is a simple test for this, which any mechanic can do

https://www.youtube.com/watch?v=a3J00_e7fyo

https://www.youtube.com/watch?v=g5Hbweydb3s

https://www.youtube.com/watch?v=888jdjVXP80
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For many of the 90's and 2000's Toyota various models - Camry, Tacoma, 4 Runners, Corolla, and some other models overheating is usually caused by temperature sensitive fan switch on the radiator not operating. Electric fan on the radiator should operate when temp above 200 degrees. Less often the control relay 90987-03003 is defective. Check if bubbling in the radiator smells like exhaust. That would indicate a blown head gasket. A jumper wire from your marker light positive to the lower contact in the fan control relay socket will operate your fan when parking lights are on. The larger vehicles with more powerful radiator fans will need a hefty jumper from a headlight positive to avoid overheating the lighting wiring. Make sure the engine is off and warmed up to check the radiator core with your hand to see if it is getting circulation. If it is all cold the thermostat might be stuck.

cound be the crank sensor going bad.

Possible coolant temperature sensor problem (the one for the ECM, NOT the gauge). Changed a few of these in my time.

Your coolant all leaked out, or your thermostat locked shut, and the engine seriously overheated. Some makes will not start again until the thermostat has been replaced (the Japanese have always been too cute for their own good, and program such things into the vehicle computer) and the computer reset, and sometimes this simply kills the engine altogether. Proper maintenance is a must!

is check eng light on what other cks have you made