I don't know the year of the engine (though I will have the serial number on Tuesday) but my Motor's Manual shows the 302 as being available from '52-'54, all years with the same tune up specs. My GMC maintenance manual only shows information for the 228, 248 and the 270.
The reason I'm interested in the dwell number is that I thought it was a more precise measurement than the feeler gauge derived gap setting. I have an old Sears Engine Analyzer that gives the dwell reading and with a couple of quick point adjustments I can get it set accurately.
