pretty sure the wide vs narrow small block AC rads were a 67-68 thing. In 69s they just increased the row count and kept the same narrow rad. that is why for 69, there is only 1 SB shroud, but for 67-68, there is 2 diff ones.
you can use a 68 SBC AC shroud on a 69 SBC with a 23 inch (68 AC) radiator. The only difference you will see is the shroud on th 68 has the engine side edge about 1 inch closer to the engine than the 69 causing the fan to stick a bit further into the shroud if you have a stock fan set up. The difference in shroud depth is to accomodate the difference in water pumps - the 69 using the long pump and 68 the short pump.
Running the 23" 4 row with a "814" offset shroud on my 69 sbc. Worked well for last 10 years or so. About to swap the factory style radiator for a aluminum stock replacement from Entropy , a sponsor here. Will post install photos later. Unit was shipped few days ago from Chiago.
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