My 66 rover currently has a kodiak MkIII heater installed in it, but it only blows luke warm air. I have also noticed an occasional antifreeze drip from the rear of the passenger side wheel well. My question is this: Should this heater produce good heat output if I have the core rebuilt, or should I just invest in a Mt. Mansfield heater? The cost of the Mansfield is more than I really want to spend. Also, I do not have the air intake on the right side wing on my truck. Can the Mansfield heater be set up to accept the heater duct set-up on the front of the radiator panel, or will I need to cut the hole in the wing?

If I stay with the Kodiak, are new cores available, or will another type of core fit? There aren't many radiator shops around here that I can find to rebuild the original, but I am willing to travel.