67 twin turbo dart

Almost every aftermarket ecu wants 43.5 base pressure. Some want 58. It doesn’t really matter as long as the injectors are scaled properly. The shop may have had issues getting your 210lb injectors idling clean at anything higher than 32. I just want to make sure that your regulator is boost referenced and rising with boost. If it’s not, or dropping fuel pressure with load you’ll burn it up.