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If you haven't got money in deal I'd seriously think about MSA ceramic coated headers. I've got 6to1s on both my cars and very pleased after 10 years of running them with MSAs 2.5" aluminum, I think, to the back bumper. They have other configurations but I like the sound and backpressure of the the 6to1. It's loud but only if you chose. Stay out of it until you get away from neighbors and then who gives a flip. It sounds like a Jake break coming down the small mountains of the Appalachians I have close by. If the guy won't talk to you, it's not going to have a wonderful ending no matter what you pay him. Get out while you can.

I bought an N42 that had been in machine shop jail for a few years, guy never came back for it and I paid maybe $200 for a newly rebuilt head with an oiler cam installed. Put it on and went about 5 miles and the god awfullest noise came from the valve train. Limped back home and found a lash pad had come off. Thank goodness there was no damage and @Jeff 78 280z talked me down off the ledge, told me how to fix it and I've not had to look back. Runs great every since.

Arguing with your machinist is worse than arguing with you doctor, he's always right no matter if he's wrong.

Those run through the manifolds to warm up a cold set of carbs. They circulate coolant through the bypass lines on the passenger's side and then the thermostat housing. I think they are a potential leak waiting to happen so I have mine disconnected. It's plenty warm in Alabama so they add unnecessary heat through my manifolds. The bigger one near the windshield is actually a thermostat that closes the flow off when it gets to a certain temp and you're right about the front nipple, it goes to the thermostat housing. Here's a bunch of threads about it. https://www.google.com/search?q=240z+intake+manifold+coolant+line+classiczcars.com&rlz=1C1VDKB_enUS1121US1121&oq=240z+intake+manifold+coolant+line+classiczcars.com&gs_lcrp=EgZjaHJvbWUyBggAEEUYOTIHCAEQIRigATIHCAIQIRigATIHCAMQIRigAdIBCTMwNTQ5ajBqN6gCALACAA&sourceid=chrome&ie=UTF-8

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