Retro fitting an AC setup.

whitepunkonnitro said

It can be done, but you'll have to use a 67-up throttle assembly.
A donor section of 67-up A/C firewall will help simplify things as well.

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What's important about the throttle assembly. I have to change mine up any ways due to the Offy intake and 4bbl carb. Why does it need to be changed based on AC?