[Steve Mtt]

I had feeling that would be a possible option, in the sport compact arena there is 3 different allmotor classes.

Pro Stock:3/4 chassis, fiberglass body components, methanol, drysumps ect Range 9.1's to10.0's
Pure Street: Motor swapped cars, kind of like putting a BBC in a street monza Range 11.0's-12's
Street Stock: Stock motor for chassis, unlimited options changing motor components 12.0-13.0's

A CU/Weight ratio may be the only way to get the street cars involved without massive amount of written rules or drastic motor changes.