Need help perfecting the budget build hemi swap

Jeez, 1, 2, and 5 all look like voltage regulators to me, though without looking them over in person it's hard to say. I'm sure you know what you're doing tracing wires though. Either way, you probably should keep one regulator at least. The stock 5.7 alternator isn't internally regulated to my knowledge. I'm using my old regulator hooked up to the field for voltage regulation.

3 is probably up to you. The idea might be that having a resovoir will allow the doors to actuate after the engine is shut off (or just to help build vacuum if you have a weak signal from a large cam or something similar). My 71 Vette is supposed to have the same thing since the headlights and wiper cowl cover are vacuum powered, but mine leaks so the engine has to be running for the headlights to go up or down. Another guy in the local Vette club could move his with the engine off because of his resovoir.

4 is most likely a hot water control valve. The idea being that if you don't have the heater on, you don't want hot coolant in the heater core because it can radiate heat into the passenger compartment, even with the fan off. My old Vette has the same thing. When you turn the heater on, the vacuum signal opens the valve and allows coolant into the heater core. Strictly speaking, you really don't need one. It's more of a comfort issue. When they go out it can suck though because it can fail closed (what happened with my Vette), so I had no heater and couldn't figure out why until I found that valve.