Early A-Body Header Question

I also saw a set of long tube headers for a Ram on Ebay earlier today. I'm sure they won't fit on the early a-body, but I guess they're available for the trucks though. My 1964 Valiant has fenderwell headers on it now and I'd like to get those off and I'm just looking at the alternatives. I imagine the shorty headers wood be better than stock exhaust manifolds(273) that would fit on this car. I'm just wondering if anyone has tried this yet.