I installed a 5.7 in a 70 GTX on an Alterktion. I used an engine from a car not a truck. The engineer at TTI flat told me he could NOT make a set of headers for that application. Could not get around the starter. I really do not understand whay everyone "has to have headers" on these gen3 hemis. The exhaust manifold is so short to the collector ,how much can you really gain for the money and hassle.
Can it flow much better than this once you pass the heads?