the crown vic will be too wide---the volare is alot of work to do right----however the front clip to a jaguar xj6 can be perfect---it takes 4 bolts (+ motor mount bolts) to drop it and it can lay beneath the dodge frame----on my 50 hudson it was narrow enough to allow wheel spacers to change the 4.75 pattern to the stock 4.5 pattern and still fit police wheels under the hudson---worse case scenario you can also use the jag rear----those rears are popular because they use a dana 44 center section and are stronger than a corvette rear.....