When they first came out the (3dr) Cosworth had issues with the head gasket. This was especially a problem in Germany on the unrestricted autobahn. If the driver accelerated hard the cylinder head expanded due to the heat and when the driver lifted off the head contracted again which moved the head gasket. In the end it was solved with a metal Omega ring in the gasket. But in my opinion this shows that quicker heating of the head than the block can give problems with the head gasket. IMO driving it gently when cold will also make the chance of a head gasket failure less likely. On boosted cars the head gasket will have a harder life anyway due to the higher cylinder pressures (more power out of the same cylinder volume than an atmosferic engine).