Thank you all for the replies. The replacement gasket kit was a Victor Rentz (SP). The more I get to know my way around the M104 and reading too many forum posts i'll get an OEM next time around.

I don't have a compressor so I just sprayed a solvent (carb cleaner) into the SP well and sopped up the liquid with shop towels. It took a bit of time to get it all cleaned up but it worked.

I've checked the plugs recently and they are dry, no oil, so I'm happy the replacement gasket and the job is complete. This repair was my first real attempt to become a DIY'er. I'm having a blast but I wish my wagon was a better cared for before I purchased. Good thing is i'll know what to look for in future purchases.

Again thank you all.