Phil,

Hmm, ok without getting into involved disassembly, I suppose if you were to connect the new chain down at the bottom and run some sort of wire tool down the guide, you may be able to pull it up through there, but this is purely a visualization off the top of my head. This one could be tricky!

If you are interested, I do have a 220 engine out of a '73 model. It ran great when I pulled it (the car was too rusty to be driven anymore), but I have pulled the carb (Stromberg 175) to use on a friend's MG. You can have the engine for $150 + freight or else come pick it up.

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Regards,
Aaron