[69heavychevy]

I have the B&M pan mentioned above. Very solid unit. I've used it with a cork gasket and had no leaks. Correct torque is key with cork gaskets.
By the way I had the same issue with my trans leaking after sitting a few days. My leak was coming from a hole in the slip yoke. Threw some silicone on it, and stopped it. Now the only leak I have is from the speedometer bullet, haven't been able to fix that one.