the valve on intake port side and exhause valve on exhaust manifold side.

I think you mean QR-1 valve, and you're not guaranteed to have that. You could have a QR-1, QR-1, or an R14 relay valve. It's usually mounted high and near the center. Go under the truck, follow the lines from the emergency chamber of the brake chamber up - the valve they both connect to will be the metering valve for the spring brakes. A QR-1 valve will have three air lines attached to it, a QR-1C will have four, an R14 relay valve will have at least five.

They will fit on every small block engine from 1987 down to 1955. You will have to install a PCV valve in 1 of the valve covers. Your choice on witch 1.

check your PCV Valve

a gate valve is a valve you turn the handle round and round until it shuts off a ball valve is a valve with a lever that you turn 1/4 turn and its off hope this helps plumber paul