Hey Machery,
I love the CobraBob gasket myself. Used it on my 2004 Roush and use it on my 1967 Mustang ( T5 swap ) Either way you cant go wrong. Gasket maker isn't too bad to use, just make sure you don't make a mess if you're installing inside the vehicle.
Also, if you're swapping the shifter, now is a good time to do a transmission flush. Simply open the drain on the bottom of the transmission, once drained plug the transmission and fill through the shifter hole. Extremely easy, and good ease of mind!
I hope this helps,
Thanks,
- Sinister Mustang