I did the whole kit-n-kaboodle at once, at 20 years n 140k. not sure what the age and milage of your rig is. I have a 99 and was watching for signs of lower gasket failure, sure nuff after a 16 hour trip I smelled coolant. I did rad, heater core, water pump, hoses and that quick connect all together.
Also, for you folks that have an oem cali set up you probably already have mpfi from the factory. My truck’s spider was a leaky mess, on the scanner it showed fuel trim was -40 so, yeah it was a good time to swap that too.