Originally Posted by pastorbobnlnh

I'll second the 'caveman's suggestion to remove two links in the chain first. The Deore should be able to handle the 34T. With that said, finding a 32T cog for your Shimano 600 freewheel should be your next step. I could have a 32T. I'd need to check.

I've been going in the opposite direction with my '83 Paramount. Recently I swapped the clincher wheelset with a 7 speed (13-32) Sachs freewheel for a tubular wheelset. Unfortunately the tubular rear wheel is spaced differently and the 7 speed would not fit without the smallest sprocket rubbing the stays. The closest freewheel at hand and available was a Sunrace 14-28, so on it went. I did miss the extra 4 teeth on a few climbs.