Coolant Crossover Pipe Gasket Do-Over

I replaced the crossover pipe gaskets with OEM ones when I had my manifold off for powder coating and torqued the bolts to FSM specs. Unfortunately coolant was pooling on the top of the block. It was a slow and small leak but I know I need to fix this issue now before I put the engine back in the car.

Has anyone got any other tips, tricks, or methods to make sure that I don't run into the same problem again?

Cheers,
Ryan