Cant comment on the barbed fitting, but another way to restrict the coolant flow to the heater core is to use a thick stainless steel washer placed right at the heater core inlet, I did that on my aluminum head engine 10+ years ago and it seems to be working fine, no problems with the heater core... but I have also read & seen where nothing was used to restrict the flow and no problems with blown out heater cores.
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