80's crown vic rear suspension

I am looking into buying a 87 crown vic, it will eventually receive a mild 520ish engine. It will see only limited TNT time at open track nights. I would assume building stronger and adjustable controls arms will be necessary with the possibility of a coil over setup also. Should I also plan on multiple mounting holes off the chassis for more tuneability? Any info or suggestions would be appreciated. Thanks.

I'd box the stock stuff and add some good bushing. And see how it does.

That makes sence, I have a tendancy to over think things and make more work were it is not needed. Thanks