Interestingly enough Hedman is probably the cheapest and the make the lowest profile header(tucked) header for that engine. The will sit just inside of the frame rail and they will never touch the ground. Mine is lowered 3" and I haven't ever bottomed out my header flanges and I am running the long tube headers. While I have a Cleveland, I have built a few with 302's and tried a bunch of different brands of headers(owners choice), only to find out what I already knew, Hedman tuck the most!
For mufflers, keep in mind that headers make everything flow faster, and as a result create more noise. So someone that has stock manifolds with turbo muffler's is going to be way quiter than that same engine with headers and turbo mufflers. Dynomax will give you that standard turbo sound, but with headers, they tend to resonate a tad, Flowmaster makes a 3 or 2 chamber Delta Flow that isn't too loud, but also still resonate at low rpm and idle just a bit. My personal favorite by far is Spintech. Made here in California, they sound very similar to a Bassani system at a fraction of the price. I expalin it like a Indy Car sound, as opposed to a NASCAR(like Flowmaster) sound. It's a higher pitch sound with no resonation and relatively quiet inside the car, but with a very clean and unique sound out the back. Then when you get on it, it comes alive witha very throaty beefy sound, but still retains that pitch difference. It's a very unique sound and a highly recommend them. It'll make your car sound different then any other one out there.
If you are looking for more of a stock type sound, but still want a little something but without resonation, I'd put some Magnaflows on there. Quality design and sound, but with very little tone.
Good luck!