Getting back to jmiller's question - I was at a cruise-in last Fri. and a guy came in with a '50 Chev 3100 with an engine that sounds a lot like what jmiller describes. I could find no casting numbers on the block and there was no stamped numbers on a raised boss behind the distributor. I finally caught up with the owner and asked him what the heck it was - 302 GMC.
