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Unfortunately, without the accessory mounting point is the heads, your options for a clean, functional, and inexpensive solution go way down. Aftermarket front engine accessory setup is one way but another is to have your double hump heads drilled. However, drilling mounting holes has risks since all heads are never cast the same.
 

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Calgun, have you found a solution to your original issue of no accessory mounting hole on your double hump heads? It seems you're being caught between a sense of nostalgia for keeping and using double hump heads and the desire to have AC in your classic. Like you, I faced this dilemma when rebuilding old motors and wanting to retain that "stock" appearance.

Here are a few thoughts and suggestions:
1. The old heads are not only hard to find but can quickly get expensive to rebuild. If you a lucky enough to find a good set, the exhaust valve seats will require hardening or inserts installed. Additionally, these old heads don't necessarily flow as good as newer more modern heads.
2. Most newer cylinder heads flow better and just about all of them have accessory holes.
3. Weight saving option between aluminum versus cast iron weight.
4. Lastly, stock GM front engine accessory setups are plentiful and sitting around in bone yards for cheap. I've used the setup from a 4.3L V6 which fits perfectly on a V8.
 
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