Anyone know this engine builder????

[Mr. Duece]

I know it's a long shot but figured I'd give it a try. I recently purchased a 27k mile 68 L78 Chevelle. Upon speaking to the previous owners I found out the original engine was kept by an the engine builder in 1980. He was the owner of a Chicago area machine shop. This shop was located in unincorporated Leyden Township/Melrose Park on Grand ave. just W. of Mannheim Rd. Can anyone from the area help me with the name of the shop or the whereabouts of the owner? Again it's a long shot but it's all I have. Thanks, Don