You may need to watch for the accessory bolt holes in the front of the heads. The fuelie heads don't typically have any.
From a purely traditional point of view; this would be the best reason to use them. On the 67 and 68 350's, the camel hump heads were standard, the true "fueler" heads were not used after the 65 Corvette, but the same castings were used on the 66 and 67 L79/327 and 67 and 68 Z28 302's.
They will physically bolt on since they use the same gaskets and manifolds but the older heads don't have hardened valve seats for the newer unleaded fuels. That can be done when the machine shop rebuilds the heads but it can get more expensive than using the later heads. Just something to consider.
I have done this many timesand as an added benefit the 327 heads run cooler. 350s are designed to run at 220 degrees for emissions but the 327s run at 180. The difference is in the water passages.
Just had an engine built doing that. I had camel hump heads reworked (new hard seats and 3 angle valve job, and fit to a 350 block. Runs really good on the test stand. I didn't want the accessory holes in the heads as I am building a sorta early style truck.
In my previous post I failed to mention that the 327 was still available for the 1969 model year, they were a pretty low hp engine but they did use the same basic heads (accessory bolt hole style) as the low hp 350's in 69.