FPA (Ford Powertrain Applications) makes an awesome set of headers for the FE. C-6 xmember kit for the 64' can be purchased at Crites for around $70.00. Nothing really special about it but I did need to do some mods with a saws-all and a welder to get the pan to fit. Otherwise, I was able to use stock driveline and yoke.

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64 Galaxie 500 XL (constantly morphing)
FE 431 Stroker, C-6, Comp/Crane Roller assembly, FPA headers, Edelbrock heads, Zex n2o, Hydroboost.