I have two 88-89 ecu's that are chipped for sale. Both have zombie chips.
ECU codes are F220 and F231
the F220 is socketed, the F231 is not, the chip is soldered directly to the board.
Anyway, I'd like to get $60 shipped each in the continental 48.
I am not 100% sure, but i believe there is little to no gain at stock boost. gains are seen at higher boost. it also allows you to run past the boost/fuel cut, 12psi for most people. Sick dynod his car on stock boost with and without the zombie chip. I don't remember his results exactly, but it was minimal if anything.