Best Coilover IFS for '71 duster?

I think with my needs the HDK sounds like a good fit. I'm still a little ways out from purchasing anything but if I can get this 8.8 to fit then the rest has been done before and I'll have a better idea what to expect. Denny ever put any thought into IRS systems?

IRS....no , but I have the triangulated 4-bar on the drawing board....the early A body is all but .done...the E/B body is at the cutters... after that the 4-bar will happen.