68 radiator

[dardal@xxxxxxxxxxxxxxx]

My green 68 sedan is running a bit too warm lately.  This car has had rust in 
the block, and I have tried to flush it unsucessfully in the past.  As some 
might recall, I had temporarily solved the problem by adding a motorcycle 
radiator behind the grill, and hooking it up with heater hoses and valves.  But 
now, this auxiliary radiator is clogged!  The main radiator seems to flow 
throughout its height, since its uniformly warm.  Also, that radiator is not 
original, since its number does not match the manual. I have been told its a 3 
core radiator.  Somebody is selling me a 4 core radiator that the numbers 
match.  The questions to the group are two.  First, how can I confirm that the 
radiator on my car right now is indeed a 3 core?  If it is, then the 4 core 
should do a better job.  Second, is if I give you the part number, can somebody 
identify what the radiatorcame from?  If yes, this will happen in the morning.

Thanks, D^2, 2x68s, both non original radiators!