Hi, I have a recently purchased 1970 Mach 1 clone with a rebuilt 351W. It has E-force hi-flow aluminum heads and an FMX auto trans. I have tried to install new headers (Hooker part number 6901) and they will not clear the transmission cross member brace welded to the floors. I have purchased a set of 6208 hooker headers that are supposed to have the larger port size for the exhaust, as well as be longer to clear the undercarriage of the car. Has anyone else gone through this? What was your solution? Thanks.