Hello and welcome!
1. The gp relay is temp sensitive, it has it's own temp sender on the engine, same as the sender for the dash gauge. Sounds like its disconnected so it thinks it's freezing cold. It can't tell whether the engine is running or not.
2. The stock turbo has a tiny exhaust housing and it should spool quickly.. Check the obvious stuff like exhaust gaskets leaking. Retarded timing could be contributing to the issue. Get everything set correctly then turn up the pump, more fuel will spool it more quickly. When you time it take the time to check that the cam is timed to the crank correctly at TDC. I have worked on one with the cam and crank a few degrees out and it was a total turd.
3. Not sure if you mean leaking at the base where it meets the head, or the base of the injector body leaking where it is threaded together. At the head there is a heat shield which is also the "seal" to the head, though it's metal. They are one time use and crush when you torque the injector down. If the body of the injector is leaking it will need to be disassembled, the halves lapped and reassembled.
Not sure who has the monarch nozzles, I'm running the gtd nozzles and haven't had an issue. Good luck with it and please post up some pics! Always interested to see a d24 swap, not many on here...
Jason
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