With the stock valve covers it's no big deal. The only mods that I needed for the Indys was to slot the holes for the blower motor to pull it further from the valve cover. It is very tight with the Indys on it. I only have about 1/2" from the blower motor and the spark plug wires just touch the master cyl. Just a note: You will have to pull the heater box and the master cyl in order to pull the valve covers. Not practical for a race engine but for a hydraulic cam it's no big deal.
