Different head gasket question??

[10drum]

Greetings,

Ok, The driver side head gasket has been leaking oil out the back for awhile now. I originally thought (hoped) it was the intake. I replaced the intake gasket and was able to clean the back real good and now I'm sure the it's the head gasket. The truck has a 307 with low milage but sat for many years. I've pulled the head on the drivers side and see where it was leaking out the back, probably did it since new. I bought a top end kit and it had both head gaskets and all the others because it was cheaper than just one head gasket and the intake kit. The kit has a fibre faced gasket which is thicker than the original steel gasket. The passenger side is fine I don't want to disturb it.

Here's my question:

Will the thicker replacement gasket affect the compression enough to cause a problem? the original is .0275" thick and the replacement is .045".

This may be a stupid question, but keep in mind I'm a British motorcycle guy and head gasket thickness on those critters is critical.

Thanks for all replies.

Phil