Possible leak from IP
 

I recently picked up a 1987 F250 6.9 IDI. It had a noticeable leak from the Injectors so i replace the return lines and o-rings. Turns out it is still leaking from somewhere else, possibly from the bottom IP. If the IP is leaking, is there any scenario where i can repair the IP or am i looking at buying a new IP?

I would bite the bullet and replace it, one thing I've learned is that once they start to leak, a replacement is in the near future. Maybe someone else can chime in and tell you something else, but I would just replace it.

check on passengerside ... little triangular shaped little metal window with 2 1/4" screws in it .. the gasket behind it likes to leak ....

also take some non-flamible electric parts cleaner and compressed air (if you have compressed air) ... clean and dry off the IP... then fire it up .. i tcould be one of the sensors, the input line on the IP has a small rubber O-ring on it ... it will leak there .. check to see that its not loose, Use a 5/8" crows foot and check each injector line as the can be loose or maybe have a crack in one , see that many times also .... report back when you have results