longstroke compensation

Hello,

I'm building a 210 malossi with 210 mallosi cyl. head (57mm stroke), and mazuchelli full circle longstroke.

From the info on the webshop i understand that i have to compensate the cyl head with a 1.5mm head gasket for a torque/touring setup.

Do i have to add the 1.5mm gasket to the original one (0.5mm brass,) or just replace it?