My goodness! You got a heck of a deal there! Ican't identify the plane, but it sure looks well built. I suggest that you don't run synthetic oil through that engine. From the looks of it, it was run on castor oil which built up a protective coat of varnsh on all the moving parts. The synthetic oiil will strip the coating out and it is likely to run very hot and may seize. DOn't be too concerened if you do run it before you read this, just change fuel and run it as if you are breaking it in again from new.
Best of luck and enjoy it!
Justin