Finally found that elusive 64 Sports Coupe I have been hunting for two years now. 79,000 mile 100% original car. A complete ground up restoration is in store for it, but with a more modern power train. A crate Ford Racing 427 small block with a strong version of the Borg Warner T5 will replace the 289/c4. Current diff is an 8" Trac loc. I know I can fit a 9" in there real easy, but what about a more modern and lighter weight 8.8"? I would have the benefit of factory disk brakes and a good selection of gear ratios, but will it hold up to the 520 ft lbs of torque the 427 delivers? Another option might be to replace the 8" third member with a rebuilt and beefed up four pinion like I did in my '70 Mustang 351w. What do you Fairlane fanatics say?