My 85 c10 chevy still turns off when I get up to 25 in 2nd gear. White smoke still continues to blow out white smoke out of the right header. (Open headers)

See if the diagrams in the link help

https://www.gmsquarebody.com/threads/85-c10-vacuum-hose-diagram-pics.29486/

https://www.google.com/search?q=1984+Chevy+C10+vacuum+hose+diagram

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White smoke is usually coolant in the combustion chamber. Check for leaks, with a pressure tester.

The colour smoke an engine produces gives a good idea of the fault: -
Black/dark grey smoke is partially burned fuel caused by the right amount of fuel being injected badly or by a small excess of fuel.

Blue/blue-grey smoke is burning engine oil.

White smoke is either steam (usually from coolant ingress) or massive amounts of unburned fuel. A few possible causes of the latter is strangled exhaust, one or more injectors stuck open or a damaged injector (broken nozzle).

If there is no coolant loss I suggest you remove the fuel injectors for testing.

If it was white smoke then the head gasket failed and now the cylinder is full of coolant and you cannot compress liquid so the engine is seized.

White smoke out of the exhaust indicates moisture (water) in the exhaust. If the car is not driven very far each day, some moisture will collect in the muffler and cause white smoke for a short while after starting. If the smoke is continual, however, you need to watch you coolant level as you may have a blown head gasket.

white smoke is a sign of water/coolant entering the fuel system , possably head gasket giving out under pressure as you build up speed , check the head bolts are tightened to correct torque , if so take head off and look for signs of coolant leeking across gasket

white smoke is water passing threw cylinders which generally means your head gasket needs replaced.

if still billowing smoke [[burning coolant ]] the coolant being burnt with the fuel will knock horsepower to over 1/2 --have work that was done rechecked and tested since its still blowing white smoke wasnt fixed correctly --fuel +air + spark for combustion and power not coolant / water added

White smoke means there's water or coolant mixing in with your fuel. Could mean a blown head gasket or intake manifold. The more you drive it like this, the more expensive the damage will be to repair.
As you have already changed the regulator and checked sensor the above can be a problem please check

Relative to other engines with the same size, the degree of difficulty is the same since most types of vehicles has the timing gear/chain facing the radiator. As long at you know where the timing lines line up and you should be good to go.