Might fit, what's the track?

Near as I can find, not being a truck guy, the 63's track is 64.7"

the Crown Vic is 62.8"

So it ought to work but the kicker is it appears that the frame width is the same at 34" for both.

Some time with a tape measure and online looking at CV swaps might pay dividends.

They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.