Tin Indian uses the FiTech system on their TriPower setups that last I knew. I don't think it's a one-off part.
The FiTech TriPower is supposed to be a Holley 2300 flange. However, there are reports that this isn't quite right. I believe they likely made the throttle bodies in such a way as to try and achieve fitment on most make tri-power and six packs. Depending on the setup of the intake manifold, it may be necessary to enlarge the bolt holes on the throttle bodies to get them to sit correctly.
Tin Indian would actually be a good shop to discuss this with, and possibly even purchase the setup from. They've done a lot of testing on this and they've got a lot of parts for it, including some adapter plates as well.
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-Jason
1969 Pontiac Firebird
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