Welcome - Which Jag are you using for the donor for the IFS. I used a XKE under a 32 highboy w/chey discs. The ride was excellent. I built a 48 Chev trk about 7 yrs ago & used a front steer Camaro IFS,chopped the top 3" & made the bed using 14 gage crs & 1 1/4" pipe. Used leaf springs on the rear from a Dodge Diplomat.
I am currently building a GM converted RR Silver Shadow(1966). Chev motor/700R4/El Camino stretched & narrowed fram w/12" discs/ss gas tank etc.... Happy motoring Don