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The funny thing about aluminum radiators and heater cores is that they WILL crack and leak, just a matter of time. I'd keep the copper heater core simply because of this, they are a PIA to replace especially if you don't want to scratch the paint.
I went ahead and ordered a core from JBG as well as a seal kit. I hope their adv. is correct that the core is an exact fit as far as tube length. Its not an aluminum core, hopefully it will last.
I bought my heater core about 15 years ago at Autozone... it started leaking about a month ago. I took it out and they gave me a new on under their lifetime warranty deal...
SO.... Might want to consider that.
Same thing with my starter which was older than that... they just gave me a new one no questions asked.