No need for custom headers.If the engine is mounted in the right spot there is plenty of room to use the stock manual steering box and use the stock straight axel front end.I have both on mine and there is plenty of room.I had to run a shorty water pump and steel fan to have enough room at the radiator.The block hugger headers or the stock chevy rams horn exhaust manifolds will work.Look for the 2 1/2 corvette manifolds if you want a little better performance.