69 Dart 360 exhaust

If you're going to more power later anyway, if it was me;
I would get the 340 ones, cuz later, to get your power-numbers, you will for sure need headers, and
then you can sell the 340 manifolds for the same or more than what you paid for them. Whereas, selling the less popular logs, bought from a store, you will take a hit on them.
My opinion is all.

oh and BTW, yes the 340 logs work with power-steering.