The reason I suggested using the stock bolts is they can only be used with iron heads.
The washers on the ARP allow the soft aluminum head to be protected from the fastener as it tightens.
ARP makes good stuff.
I read if the car was equipped with a factory high performance engine it also got the black grille and tail panel.
My car is a non R/T with a 340 and it is black in both places.
There is a post on the FBBO site you should look at.
Vapor Separator is the title posted by Charger Fan.
The diagram and explanation posted by Vaanth will help you for sure.
I wouldn't worry about the liquid fuel return. The car never had it originally and fuel vapor lock does not seem to be one of your issues.
I would concentrate on the fuel tank venting side of things.
Just to clarify.
The three lines I mention are hard pipe lines that run under the car from the engine bay to the rear of the car - not a 3 nipple fuel sender/pickup.
Your sender is likely to have been only one pipe originally and if the tank does not have the 4 vent nipples it is also wrong...
The pipe on the fuel sender/pickup is for liquid fuel to return to the fuel tank and has a separate line running back down the car.
These cars had 3 lines fitted at the factory. 1 for fuel to the pump, 1 liquid return line and 1 for the tank vent system.
As your car is 1972 and the high...
That is the standard dash switch plate.
Performance Car Graphics has the new plates - or they did?
Set the switch plate up flat and soak the decal plate in turpentine over night to break down the glue.
I just levered my one up with a toothpick.
Fix the new one on with Elmers rubber cement.