On the back of my 5.0 ho motor on the heads there is a bolt that holds a pipe on which connects to both heads. Im not sure what it is but I dont think I need it as im switching to carbed. What would be the best way to plug these or do they need to be open? Also is it possible to use the oil sensor on the pan in my 83 to well... tell me when my oil is low? Trying to get it all working with as much stock stuff as I can until I got the money to get it good.