SB Chevy TPI manifold help (urgent)

[John S Gwynne]

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   I hope to find a SB Chevy TPI manifold at a local swap meet this
weekend for an EFI project. I would like to know if anyone is aware of
any significant design differences over the years. Bare in mind that I
don't care if its MAP or MAF nor do I care about any ECU differences. I
would like to know about any changes to the throttle body, mounting hole
locations (engine or accessories), runners, etc. I intend
to mount this on a target master engine.  I'm somewhat aware that one
of the head mounting bolts is at a different angle, but that the hole
can be changed to fit the older heads (true?).

Any help would be appreciated. Thanks.

                                       John S Gwynne
                                          Gwynne.1 at osu.edu
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