'78 grand marquis speed upgrades

Hey guys. This is my first time posting here. I have a nice 1978 Grand Marquis and Im looking for ways of making this thing FAST. Im running a 460 police interceprot right now and the only mod Ive done is a K&N air intake but Im looking for suggestions on what I can do as a real mod. I was thinking maybe new racing headers but I cant seem to find any. Does anyone know a place I could get them ordered from? I was also thinking of maybe getting a nitrous injection kit for it but Im not sure if thats the kind of upgrade Im looking for. There are options such as turbo and super chargers that seem appealing as well. If anyone has any ideas to boost my 0-60 time Id like to hear from you. If anyone has any websites with 78 grand marquis performance mods Id like to be able to check it out.