5.2 Magnum exhaust manifolds on a Valiant?

The headers are going to be the best performance gain. The problem is they wil hang real low. So the the decision is up to you, if your sits low now, put those headmans on and you'll beat them up real fast. If you are careful and don't drive over speed bumps and railway tracks they'll last. I know there was an article written (Mopar Muscle) That showed the gain from 340 HI po, to magnum manifolds was very slight.