The white skinny tube is the vac line for the MFA, connects onto the vac pipe going from the inlet manifold to the brake servo. K-Jet is a b!tch, crack the fuel feed to the metering head, with the ignition of and see if fuel weeps out, check the spark by removing a plug and earthing to the block using insulated pliers, remove an injector, put it in a jam jar and crank it over. Double check the cam timing and make sure it's not the cam sprocket that is 180 degs out as this will make the engine turn over slowly as it opens the valves at the wrong time, tbh my money is on the cam timing.
This is an epic thread btw!