The Car in the tune had a Lincoln V12.....you got a Modular 4.6 8 cylinder,....now does Modular mean you can tack on another 4 cylinders?? Ok maybe not....You should be able to scavenge some Mustang bits to make her go.

Just do me a BIG favour and don't get carried away with the air suspension thing, I'd hate to see a Town Car bounce down the road and then settle down to scrape the undercarriage ala low rider.
take a little trip, take a little trip and see,.....
we would have to have an intervention if you went that route

Frank