So, swapped tank screen, lift pump, blew out fuel lines, swapped feed and return lines to see if the sump in the 300TD tank was full of something, did a diesel purge and changed fuel filters.

Car will idle but as soon as I am under throttle while going down the road, it starts to act like my spin on filter is clogged.
Only thing I can think of now is that there's some crap in the fuel lines preventing fuel from getting to the front of the car.
Air in primary filter.

Previous owner replaced stock hard fuel lines with rubber hose and I think they are about done.

So, ordered 25' of 3/8" aluminum fuel line and will see what happens after I install it.

If you have any ideas, I'm all ears.

Thanks!

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82 300TD
75 300D
99 F350 Crew Cab 7.3 Powerstroke