Dave
Good Call,
The {7} 1968 Dart GTS 383 {w/440 conversion} was rated at 375 HP,
and specifically classed for SS/EA in 1968 {8.70 to 9.49 Wt/HP}.
The Mr. Norms {GSS 440} cars, I believe were listed as 440/375 HP
packages as well.
These '68 Dart GTS 'specials' were not permitted to run Stock Class.