I started to do this(had the Ford diff all cleaned up and ready to cut) then when I got to measuring and checking I found the Waggy diff fit much better. Center section is pushed out to driver's side more and the low pinion gives more clearance at oil pan/exhaust/pinion. I had beat up my exhaust pipe a few times with the D30 but so far no problems with the Waggy D44. Also better gear selection with LP.
IMO, Hi pinion is highly overrated.
BTW my setup was an '89 XJ, 9" lift, 36" Iroks and teh D44 was from a Wide Trac Waggy(65" WMS).