you can leave the heater hoses on but do as sr said bleed it at a 45 degree angle but use the bleeder screw, theres a reason why its there. since its the highest point in the cooling system that ls where the air is gunna exit the easiest
^^ easiest way to do it, to bad not all people have that tool lol but you can also probe your wiring in two srparate locations and check for continuity on a multimeter that's how I did mine
keep it... car looks clean and it seems like youve put alot of time and money into the s13, and besides its not like you have a dead line or you need it running asap, just take your time fixing it