WTF 727 troubles--EDIT may be fixed

Whut?? did I do?

67 dart, 77 mild 360 and 727 out of van, has been running OK

Has been slow to "pickup" in gear first time in reverse first time starting, Ok after that. No evident leaks under car I thought it was converter "bleed down." I'll admit I haven't checked fluid........

Left it parked last two days, today would not move, finally got it moving around back. Added TWO QUARTS of fluid, had no idea it was that low. Shifted OK two days ago when I drove it.

Now it's twitchy going into gear, and would not go into high on highway. RPM oscillates up and down ??? kind of "surges" like it's going to shift then goes back to second?

I've got a manual body I've been going to install, but have had other things going on