I took the car back and they stuck in some custom springs on the rear at no charge, car sits perfect now and handles alot better than I was expecting considering the cost compared to what Ive spent on suspension for my other cars.
Corners really well, ride is a bit bumpy round town but smooth as on the open road.
Just FYI I ended up with, 30mm Cobras on the front, actual lowering = 25mm been a week and still at 25mm. Rear Custom Cobras lowered rear by 26mm, still sitting on 26mm with spare and assorted junk in the boot. Monroe GT Gas, went with them purely due to the price, KYB was $120 more and they offered to swap if I didnt like the monroes, but they seem great for the price. Nolathane bushes all round, bit bumpy but bugger all body roll now, feels great.
Guys at chamberlain were really helpful, considering they ended up giving me custom springs at the stock price, and an extra 3 hours labor pissing about trying different springs at no cost. Maybe Im just used to UK workshops charging for every second they spend doing anything even remotely near your car

Current - 83 Levin AE85 Notch.
Ex - 89 Sprinter - Red Top, 88 Levin - 4agze.