On one side on the turbo my threads were so bad that the OEM bolt was basically just dangling in that space and was being held down by gravity alone.
The threads were completely gone from half up and the bolt had just worked itself loose. Threw on a GM water pump gasket on there between turbo and TMIC for good measure and if there will ever be a boost leak, I know what place it will NOT be coming from
Getting the angle
right is crucial though. If you screw the studs in at a weird angle, when you will torque the nut down, the TMIC may not sit flush with the turbo.
The gasket you want is Mr. Gasket Thermostat Gasket Part No. 738G
It's for small block Chevy water pumps