"D" codes are not for turbo engines, the "D" code was typically used in early 7.3 N/A motors. The "A" codes were for early 83s from what I heard, probably a good injector, but quite different from other stanadynes. Probably if you think you know what you're doing with those nozzles, you should order up a set of nozzles for "G" code injs. which came with the factory turbo engines. Another possibility is that you could look for a set of nozzles from Chevy 6.5 marinized injectors which often pop up on ebay. I don't know if they would fit or work but they flow A TON of fuel from what I hear. Or if you want to modify your own injectors, you could buy one 'G" injector or even 1 DPS stage 1 injector and modify the others in a like manner. I don't think you'll be too impressed with machining them to "D" specs. I had a set in my 86 and they were not too great, they didn't even last 50,000 miles with the right spray pattern and pop pressure, and they weren't exactly a powerhouse. Not bad but nothing special.