JPL street rods sells a kit for about $1200. Its Heidts, can uprgrade to QA1's, add a sway bar. A guy I know used it and is very pleased, bolted right in. He sent me photos. Not sure if he needed shock extensions or got a different shock length. There are threads on here about cutting down the upper perch too. Here is the ebay link, but you can order directly. A google search will get their contact info. I spoke with them and they seemed very knowledgeable. I can't upload the photos he sent me, but if you pm me your email or throw it up here I'll send them to you.
https://www.ebay.com/itm/FORD-MUSTAN...2470264?_ul=CR