Looks like we'll be doing the same job this weekend, the core in my 68 seems to be on it's last legs as well
I've never done this job on a GM car (but three times on Fords....conclusions to be drawn from this maybe) so can't really give any suggestions but I'd asked the same question over in 60's tech and god a couple of good answers and tips:
http://www.teambuick.com/forums/showthread.php?t=15262
Not sure if a 64 is laid out like the later models but it should at least give you an overview of what to expect. Heater core's always a big job not sure why they build them like that.
BTW, how's your 64 running? Got the motor problems squared away I hope?
-Mike
1968 Special daily driver 285K "Roadmaster"
1969 Skylark 2dr 38K 99% original- gone but not forgotten
1992 Chev Lumina 3.4 project- just plain gone
and a '75 Ford Granada project for sale!
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