Gone through ALOT of brake fluid

92 sonoma brake system issue need help diagnosing, I have gone thru ALOT of brake fluid and there is no end to the micro bubbles.

I have front disk and rear drum brakes. No antilock brakes, 2wd Its a rebuilt truck with only the basic

THE LONG STORY
I was a little low on fluid ( still fluid in resevoir) It was time to do my brakes so I parked it and was driving my car. For a few weeks
I put new pads shoes drums and rotors on the truck, then found my resivoir empty. Found and replaced broken brake line.
Time to bleed the brakes, with neighbours help. I went thru ALOT of fluid, (i have spent more on fluid then it prob would have cost for a shop to do the work.) Eventually I was able to get back brakes bled. When fluid was finally bubble free I did not pump the brakes too many more times to ensure more bubbles didnt come. This is after about 3 hours of bleeding.
Another 2 hours into bleeding I got the passenger front to be bubble free but again I didnt pump it more to be sure as I was running short on patience.
another 1.5 hours of bleeding and driver front is still giving a crazy amount of bubbles.
I thought if I drove truck down the alley it might free up bubbles but couldn't go anywhere

THE SYMPTOMS
Cannot get system bubble free.
My front brakes locked up when engine is running, if I turn off engine push the brakes twice tires unlock and there is not alot of give in pedal after a few pumps.
when engine is running brake petal is easily pushed to the floor.
I cannot see any leaks, I am sure I used the right process and method to bleed the brakes.
I am thinking master cylendar. Brake booster. Vacuum issue.
money and time are both issues so I hope you can help