I have a friend who is getting ready to invest a good deal of money into a Muscle car project. At this point, it looks like he is going to go for a 68-72 Nova. Just waiting for his '69 Firebird to sell.

The engine is already in the works, and is going to be a 475CI big block, which is estimated to output about 570 horsepower. The question we have is regarding the transmission.

First of all, this is going to be a weekend car, absolutely no daily driver. This car will have to be able to make trips on the highway to the neighboring city (25 miles or so off) and an overdrive would be great, assuming there is a good transmission that can take the heat.

Orginally, we had planned to put in a TH400. Not only is the price right, but it is relatively easy to find one that will survive that kind of power. What transmissions can we look at that have an overdrive that will best withstand this type of power?

I have looked at 700R4s and 4L60s and 4L80s, but don't really know which are better. I've been using TH-350s much, and my knowledge is somewhat limited to that style transmission. I've also heard some talk of 200-4Rs, they seem to have a good reputation.

--Cliffnotes--

What is the best OD transmission to handle 570 Horsepower?
Must be able to take some racing, and be able to sustain a 50 mile highway drive.

Thanks in advance,
Rob