pasadenahotrod said:The Modern FoMoCo IRS has been used under hot rods. There is a new "kit" available for using this in early cars, check SPirit Motors.
The main complaint about them is that the outer hub trailing arms etc. are mounted very wide on the stock application. This makes it necessary to spend a lot of time in designing and making up new mounting points further in to accommodate use under the narrower early Fords particularly those running fenderless.