TIGHT FIT ENGINE BAY 65 DART / HEDDMEN SHORTY HEADERS
Those hedman headers are no joy to change gaskets...just sayin...I have them in my 72 Scamp and while they do fit and you can cobble together some pipes between a mini starter and the T bars, if that gasket blows out, you'll need stubby wrenches and lots of patience to change them. Also, I had to dent the collector on the driver side for the block casting. I suppose your mileage may vary, but if I had it to do over again in my 72, I'd have gone a different route...the money I spent buying mandrel bent sections and having it fabbed in wound up costing basically the same amount as a set of long tubes from either Doug's or TTI.
...add to that the early A bodies are narrower in the engine bay and my own personal desire to use them would really fall off a cliff.
Summit still carries the Sanderson DD9s which are supposed to fit early As and there's a few pics of those too-might wanna check out that option.