Conveting 63' GMC to power steering and disc brakes

[Malfunkzhun]

Im trying to convert my 1963 GMC to power steering and disc brakes, i purchased a front end off a 1977 gmc and am having trouble with the idler arm.. the 77' is positioned to the left and the 63' is positioned to the right.. the 63' idler arm is loose when it is placed in the 77' centerlink where as if i were to use the 77' idler arm i would have to drill into the frame to position it right.. So, which do i do?? or do i use the 63' center link, but if i do, will the 77' tie rod ends fit in the 63' center link holes???