Problem with the panther chassis is the lack of aftermarket support...not much interest in these cars, so you have to get creative.
I'd suggest taking a peek at
Crownvic.net There's a lot of 4.6 knowledge over there, and I'm sure they'll be able to help you. Good luck!
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1989 Ford Crown Victoria Police Interceptor
2bbl Carbureted 351W V8, ported and polished E7TE heads, Edelbrock cam
AOD Transmission with B&M Shift Kit
3.55:1 Positraction Rear Axle
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Updated 1/27/07!