I have lots of used T56 parts including tailhousings etc if you need some stuff from my pile o parts.
It is uncommon for a mainshaft to twist/bend the splines.... unless it was used in a high HP drag application. It is not uncommon for tailhousings to get damaged. You could upgrade to a larger spline mainshaft and bore out the existing tailhousing.... however the 30 spline Viper shafts are on national backorder.
We have used a Stage2 built T56 (stock mainshaft) behind an 1100rwhpturbo LS car that sees 1/2 mile racing mainly.... it doesn't launch hard and has been driving without issues for 4-5K miles. McLeod RXT clutch is totally streetable.
It went 9.20@162mph launching off idle. It now runs a T56 Magnum and has a bigger turbo with 250rwhp+ more potential simply because he wanted a smoother shifting trans.
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Project: 1969 Chevelle, alum 5.3, GTS76 turbo, Chiseled Perf A/W intercooler, Holley Dominator EFI, Davis TC, JRi coilovers, 14" brakes, T56 Magnum. CTS-V Recaro seats!
Coffey Fabrication Nashville, TN doing the fabwork! 800rwhp+/25mpg+/9's@150mph goal 
https://lateral-g.net/forums/showthread.php4?t=52976
1993 Mazda FD RX-7, built LS7, T56 Magnum, Holley HP, Davis Tech TC, 8.8" 3.73 Cobra IRS diff, DSS axles, Ohlins coilovers, big brakes.
CCW 18x11 front 315/30/18's and 18x12.5 rear on 335/30/18 RA1's, 2850lbs
10.31@137mph 165mph Shift-Sector 1/2 mile speed
441ci AllPro headed motor and 200lb weigh reduction in the works....
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