Man for 300hp. You dont need the TTI ones, unless you plan on upgrading later. a set of summit or jegs headers for 110 will be fine. A little bit of pain on the drivers side, if you have power, but you don't need anything fancy.
XS2 ...... save your cash and spend it somewhere else. i have hooker and hedman long tubes on both my small blocks and they dont scrape, dont burn wires, dont leak and they are fairly easy to put on. you may hear negative things about them but i daily drive these headers and they have never given me issues, and they still look great after almost 2 years.