Bob,
Suggest you contact Jason at RJC Racing....he's got some crossover pipe gskts / spacers in 304 Stainless that I've heard work great! Although I understand that these were actually designed for ATR's & Kenne Bell V band style cross over pipes, I believe they will fit T/A's too. Maybe someone else actually running these can verify this? You can contact Jason at
jason@rjcracing.com
These are at:
RJC Racing the leaders in inovative Buick performance
Here's some info from RJC's website.
ATR Crossover Gasket; this gasket/spacer goes between the flanges of the ATR/Kenne Bell V-Band style crossover header connections. This fixes the problematic leak with those style of flanges. Made from 304 Stainless Steel These will never warp or wear out. Laser cut and precision ground for a perfect seal.
$19/set.
Good Luck!
dave