I hope you did the bellhousing alignment check plus put the correct amount of spacers behind the slave if using a hydraulic clutch.
The driveline angle is important too...Theres a Tremec phone app that helps with getting the perfect angles between trans shaft and pinion,,
In one of my rides with a TKO500 I had to get rear adjustable upper arms to set the correct pinion angle........I had to go 3* down to correct it and had to shim the transmission up 3/4" [roughly 5*]and doing those adjustments pulled the slipyoke out about 1" making my driveshaft too short after already getting it cut........
Good Luck