For temporary, I would find a piece of pipe you can use to connect the inlet and outlet hose from the heater core together. I once used a 2" exhaust coupling with two flex hoses to plumb up a radiator until I could get the correct hose on my 79 F-150. (of course I never did get the right hose ;D ) Make sure you use hose clams on either side and you should be able to get to where you need to go. But take the time to pull the heater and rebuild the whole thing. There are several write ups in the tech section plus a blower motor upgrade as well which you should be able to find with the search option. You might be able to remove one of the hoses and connect the outlet to the inlet with the same hose (on the engine not the heater core).
Good Luck!