Mine works good behind my 302. The tranny was used and I found it in a junk yard. My only complaint is that from time to time, I can jam up the shifter between gears. I've developed a better shifting pattern, so this problem has seased. Otherwise, the tranny is fine. Low gear could be lower, and if I had my pick, I would have skipped this tranny and went right to the Ford NP435 (or T18). But that would only to get the super low first.
You didn't mention anything about a transfercase, I don't think the T176 ever came with the D20. You might want to consider this if you don't have a D300. Extra costs of adapters or new transfercase.
$300 for a "new" T176 is a good price. I paid over twice that for my rebuilt T176, but it also included swapping my T4 bellhousing and driveshafts for T176 ones. As mentioned, the T176 is a good tranny and holds up to V8's.