New Dana 60 Help please

440 is the goal but if I can get a 340 or 383 cheaper and sooner going for it. could the 3 speed not handle moderate driving with a V8?
The reason I asked is that you stated earlier that you were going to race the heck out of it and now it’s moderate driving. If it was mine, and this is from someone who has owed a big block A-body, I would go with a 360 automatic and a 8-3/4. This would be your cheapest option but in the end it’s your decision.