Here's the thing......is a crown vic front suspension truly a better handling suspension or are you just guessing?
Do you know how much a welder is going to charge you to TIG weld that up? I was quoted over a grand to have my 4 link welded in professionally by 4 different shops here in town. Aluminum would cost even more I'm sure.
Nothing wrong with thinking outside of the box. Nobody is saying that. But sometimes outside the box isn't better. And sometimes it's even worse.
Here's a few questions I haven't seen an answer too. What shocks are you running, what tires, and lastly, what's your rear suspension set up?