Does the rack bolt to the cross member with two long 5/8 bolts or are there straps welded to the cross member with rack mount holes? Being a Heidt's it's probably the two long bolts. With this said there is nothing written in stone that says the rack must be center mounted. We offset one 4" on a 48 Plymouth/360 V8 combo and worked the suspension through it's full range with very little difference in toe in between the long and short tie rod sides. If welded on straps it would be very easy to move the rack for clearance but if it has long bolts through the cross member the process is involved. No more than you need could be obtained by replacing the rack mount bushings with home made eccentric bushings. Picture is a 1955 3100 with an unknown rack (probably a Speedway) with custom rack mount straps that hold the pinion (steering) shaft at an angle that doesn't require a bucket load of U-joints. You can see the rack housing has at least an inch of clearance to the cross member. On yours if you have the room I'd heat that area on the cross member to YELLOW hot and then dimple it with a BFH.

[img]https://i.postimg.cc/YvrFVNC8/IMG-4758.jpg[/img]

Evan