I have Hooker Super Comp headers for my 1967 GTO that are suppose to fit but I cannot for the life of me find the room for them. Passenger side the top of the A arm and oil filter hit and driver's side there is zero room between where the header goes and the steering shaft. Do I need to alter my motor mounts? The engine is still in the car, do I need to pull the engine and then install the headers first. Any advice would be greatly appreciated from anyone who has accomplished this feat!!!