I have the SSS dual hitachi carbs on a 1600cc, my car recently is having trouble starting and I have reason to believe the carbs are leaking. Had to loosen my idle screw a ton to get my rpm's up 500 to get a steady idle, then my 510 won't start now, sounds like it's starving of fuel. Not quite sure what's wrong but before I dive in I'm curious on how much a rebuild kit would be on my carbs?? Any input is appreciated. Also: I plan on doing an engine swap of some sort, is the 1600 a decent engine for an early Z car/ 2-door 510?