360 oiling problem under load

Would the converter balloon even at lower rpm like 2000 to 3000rpm? Btw this engine is in my 86 Ram W250 right now. Built it to be a pump gas motor with good street manners. The idea was to run it in my truck until i get the old worn out 360 freshened up, then this spring, replace the cam with the 484" mopar hyd cam and a Performer Rpm to put in my 69 swinger to replace the 30yo solid lifter 340 so its a little more street friendly. 11..1 comp, mech cam and having to run leaded race fuel isnt as much fun as it used to be. Figured with the 4 speed and 4.88 gear, even a milder motor is still gonna be fun to drive, especially runing pump gas and not having to worry about lash adjustments.

I'm not a tranny guy but I believe converter pressure is steady under load. (Maybe one of the experts will comment about this) If the converter expands it moves forward just like a stick car when the clutch pedal is pushed. Definitely check crank end play and converter clearance to flex plate when everything is opened up underneath.