Brad;
I have 2 78 trucks. One is a 2wd Big 10, 350/350 factory air and the other is a K-10, factory 400/350, factory air. I have never checked the # of cores in the radiator, but both have the same style shrouds and cushions. Both have the 6" wide sheet metal spacer over the radiator and the 2 piece fan shroud.
Hope this helps
Doug
If your support looks like this, you should be ok
http://cgi.ebay.com/ebaymotors/ws/eB...spagename=WDVW