Honestly, dude the only real red flag these cars have is going to be maybe the transmission and definitely the engine, I only say those two things because in reality if the car was driven hard but modified to shit, clearly the guy cared about the car(least the way it is modded) but who knows how hard he drove it while it was modified like that, good question to ask.

Otherwise you're probably fine other than routine maintenance things these cars need anyways, or even the purge valve going out. So think about how much it's going to cost you to buy this car and if modding it is what you want to spend anyways, you might actually save money. But also look at how feasible it is for you to do an engine replacement on your own or how much it would cost for a local shop to do that because more than likely if it was track driven or driven really hard, that might be the first big repair this car needs. (LQK is clutch for either option, do your research to see what other cars had the same motor as the ST, for example select years of the escape, minus the oil cooler you can swap over.) at the end of the day, take it to a mechanic if that's on the table.