try not to cheap out real bad. Your main problem IMO is that it seems you do not have superior knowledge of installation. A cheap ebay kit will most often times not BOLT ON and will require alot of manufacture, extra work that will cost excessive time and more money. Seeing as i know neither of you i have no idea. this is just one persons two cents. you are really going to get nowhere on ebay unless you find used good parts. i say piece together or maybe the homemade kits. i have no idea about those it looks kind of shady to. you get what you pay for. i am working on a turbo setup for a b series so i feel that anxiety. but rushing and spending hastily will cost you more in the long run.
SS auto chrome might also be an option if your heading down the o shit path. they usually have full kits for around a grand