which oil pan for my dart?

I have that exact pan on my Dart Sport that RustyRatRod mentioned and with TTI headers. It's all the same up front as a Swinger. I also use a stock volume pump and put 5-6 quarts in. But that's up to you.

The Road Race pan is also a good option along with Milodon's newer 7 quart pan for more ground clearance.
If it's on the street, you may have to be careful with the 8 quart around speed bumps, pot holes, etc..

http://www.summitracing.com/search/...ily/mopar-small-block-la/sump-location/center