I removed the head to replace the head gasket. Added Clifford 4bbl carb & Fenton Duals. Cleaned, Painted, Replaced rusty bolts, Fresh oil, Reassembled. Ran for few minutes to reinstall Dist., rough timing by sound.

When I started to refill the radiator, all the water went into the engine. Drained oil and water from pan and used a pressure checker on complete cooling system, result - not able to achieve any pressure - 0.

I'm at a complete lose as to how this could happen. It did seem that the gasket didn't exactly match either the head or the block.

Need advice on possible cause and troubleshooting/repair.

Thanks