How long has that gasket lasted?
I asked the internet and I found this; (i'm no expert)
http://www.aa1car.com/library/2005/ic010532.htm
So between cylinders points to overheating?
I'd get the head checked and skimmed if necessary and spend plenty of time cleaning up the cylinder block. Might need new stem seals and guides too? Did the head need a rebuild when the cam went?