I know I'm new here but I need some help I've gotten a lot of useful information from your forms on the site.

So I registered and became a member.

I've got an 89 ram 50 2.6 four-wheel drive automatic.
Since I've had this truck all I've had is regular maintenance it's always started up ran fine been dependable until about a month ago.

I started getting symptoms like the timing wasn't correct running real rough loss of power have to hold the gas down to keep it from dying at idle. When putting it in gear had to match the gas instantly to keep it from dying.
I went through all the troubleshooting steps that I could find on these forms here starting with the cheapest simplest things and moving up.

I replace the spark plugs wire distributor cap rotor distributor itself the coil.

Got a timing light checked and adjusted all that it didn't do anything I set it back where it was it didn't help play with the carburetor a little bit it didn't help didn't do anything still ran rough all the same symptoms.

I even cut out the catalytic converter and muffler to see if maybe that was clogged up temperatures were different on both sides.
Still nothing same issues so I put the exhaust back together.

When I did everything was restored back to normal power was back no rough idling no slow starts it was back to normal.

I parked it for 2 weeks and when I got back in it all the symptoms and issues were back again.

About a week later it sounded like it didn't have a muffler I checked muffler fell off somewhere.
So then I was left with the timing chain set which I did not get into replacing. I really thought that was the issue.

Yesterday on the way home from work out of nowhere I started pouring out white smoke. I instantly pulled over shut the truck off it was not overheating. Pop the hood and oil was everywhere seems it came out of a small crack in the valve cover now.
Almost all the oil had sprayed out so I had the truck towed back to the house got some oil along the way and some JB weld to patch the small crack just to see if that's what was causing the issues to begin with.

Came home from work today started right up still pouring thick white smoke.
To the best of my knowledge I don't see any oil in the radiator or the coolant I don't see any milky residue on the dipstick or in the oil. I can't smell gas in the coolant or in the oil however the oil that was just put in yesterday now looks a year old after a few minutes of running and smells burnt.

If anyone has any ideas suggestions or been through this experience I do need help.

I know the white smoke is not good could be the head cylinder block bearings.
Or it could just be a gasket. What else could it be to cause white smoke if there's no gas or oil in coolant for no gas or coolant in oil?

Could the whole issue have started with a oil pressure regulator being bad and cause pressure to go up crack the valve cover and potentially created major internal problems along the way?

Or maybe feasible to fix this problem because it does start right up and run just very heavy white smoke?

Point I'm getting to I guess is if someone thinks it could be easy troubleshooting easy fix possibly or more feasible to just do an engine swap?

And if I go that route does anyone know where I can get a replacement engine?

Thank you for any and all suggestions information and help.