I just want to let everyone know the hell of a time I had with my switch from my small block to big block and alpha to bravo. I pulled the motor 4 times until I realized I had an issue with the coupler bolts. If anyone ever has issues with vibration after installation check to make sure you use the right bolts to the coupler to flywheel. I used short 3/8 bolts (solid thread) and had vibration, finally figured out to use the longer bolts but make sure they have the smooth part on the bolt, it is around three thousands thicker than the threads which adds up when there is 6 bolts. Now I am vibration free, hope to save someone the headache.

New couplers come with bolts that have a short shoulder.

WOW!!! Reading this post at 3 AM was certainly worth while...I am right in the middle of doing this with twins and could very easily have made that mistake...and never known the difference!!!

Thanks for the heads up guys!!!