Skip,
The problem I had with the short TBs was the throttle linkage interference with the air cleaner, otherwise I would've just added a spacer.
Kinsler might be the outfit you're thinking of. They can convert just about anything. They have a picture of a Pontiac caliope setup in their catalogue - talk about retro look!
J.
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1967 Firebird Convertible Factory 400/4spd
Now 462/5spd Fuel Injected
http://1967firebird.atwebpages.com/
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