Remove the heater hoses from the standpipes in the engine compartment, slide them over a 1/2" pipe nipple , flushing "T", or hose splice fitting, apply a couple of hose clamps, top off the radiator, and you're on your way. You could also move some hoses around from the head to the TB coolant passages to accomplish the same thing, but the hoses will have to come off the core sooner or later anyway.
You won't have any heat or defrost, but it should be able to run indefinitely that way. Driving or running the engine at all with a leaky core is going to trash the interior. You'd have to spend hours this summer with hot water and a wet/dry vacuum or carpet cleaner to get all the antifreeze out of the carpets.
Incidentally, a heater core is about $20.00 (US) and takes about one-two hours (again, US) to change. It pro'lly takes longer up nort' because the Molson bottles are bigger and get in the way a little more....
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[This message has been edited by Vader (edited January 05, 2001).]