??? Rules...
Clint,
Something that just crossed my mind... If you leave the rules as they are, very open with the 3400lb limit, '109 block, 10.5" tire. How about letting in non-Buick bodied cars (aka hybrids) to compete. You could call it a "109 Outlaw class".
I don't think body differences would make that much difference through the 1/8mi. As long as they have a '109 block and meet the other few rules.
(2) cars that come to mind for competing in this form would be the '89 turbo T/A's, and a local guy with a '67(?) Firebird that meets all the current rules.
K.