The "camel-hump" heads without the accessory bolt holes were used on the "300 HP" 327 engines as early as 1964, or possibly a little earlier, with a Rochester 4GC carburetor, or a Carter AFB for some applications. Those heads have 64CC combustion chambers, and make about 10:1 compression on a 327 with flattop pistons, way too much compression for any pump gas except maybe 93 octane. If you can establish the year of manufacture and the HP rating by using the 2-or 3-letter suffix to the block number, I've got Mitchell service manuals from that era which should list the proper carb application, right down to the carb part number. Drop me an IM or an email if you need to.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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