Wilwood just came out with a MII based forged steering knuckle with a 2" drop and a removable steering arm. It uses the same spindle pin as the 70 and up Mustangs (Mustang II). Although they advertise the steering arm can be mounted for rear steer, it's way too high to work well with our early cars.
Now if someone were to make an adapter to lower it about 2.5" it ought to be perfect for the rack and pinion folks. It has an 11 degree SIA, which is about 3 degrees more than our cars, and one degree less than a stock MII spindle. It's .4125 shorter than our early spindles (over 1/2" taller than stock MII), but it should work fine if you lowered your upper A arm at least an inch. A lot of folks have lowered them well over an inch (mine are 1 1/2). A 17x9" wheel would fit no problem. Probably be able to make a 16x9" wheel work too although I haven't seen any in that size.
I don't know why everyone wants to make such a radical drop. I think Degins' 1.5 inch drop is plenty. If I could wish one into existence, I'd want the least amount of drop that allows it to fit safely inside the wheel.
Now if someone were to make an adapter to lower it about 2.5" it ought to be perfect for the rack and pinion folks. It has an 11 degree SIA, which is about 3 degrees more than our cars, and one degree less than a stock MII spindle. It's .4125 shorter than our early spindles (over 1/2" taller than stock MII), but it should work fine if you lowered your upper A arm at least an inch. A lot of folks have lowered them well over an inch (mine are 1 1/2). A 17x9" wheel would fit no problem. Probably be able to make a 16x9" wheel work too although I haven't seen any in that size.
I don't know why everyone wants to make such a radical drop. I think Degins' 1.5 inch drop is plenty. If I could wish one into existence, I'd want the least amount of drop that allows it to fit safely inside the wheel.