Here is the build for the Royal Pontiac 1969 350HO Firebird that ran in the Super Stack class, SS/J, that pulled an 11.92 1/4 mile time.
The other build is the Fulper specs for the 540HP 350CI magazine article.
Attention must be given to the valve-to-bore clearances when using the larger valve heads and the bore will need to be notched if it does not have them.
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