Burton power do a gasket it ain't cheap either. 1.78mm Cometec http://www.burtonpower.com/cometic-m...c4280-070.html £110

If your not aiming for the Max output i wouldn't worry about the 0.2mm. The Cr difference will be tiny.

How much have you found a 1.6mm for ? 1.3mm is cheap as chips.

My gen ford 1.8mm gasket was £141. I havnt fitted it yet as I want to get the block faced first just to be sure.