after doing some research here is what i found as rules conserning stock and modified
STOCK CLASS
The Stock Class will include vehicles that appear to be factory stock. The interior must be original or a duplicate of the original in material, style and color. Engine must be visibly stock for the vehicle's year and model. Numbers do not have to match.. No bolt-on aftermarket parts allowed. Wheels must be available for the year/model of the vehicle
The intent of the "Stock" class is to simulate an original, assembly line condition vehicle. It is recognized that most of these vehicles will have some changes and additions.
list of modifications[/color]
Interior significantly modified (i.e., shag carpet, incorrect seat material, non-factory seat, low-back buckets where high-backs belong, Incorrect year shifter)
Non-stock paint scheme/striping significantly different from production
Factory wheels of incorrect year, significant difference
Non-factory wheels
2 each Ride height altered more than 1 inch, lift kits, after-market shackles, traction bars
Deeply tinted glass
Non-factory shifter, approx stock appearance
Competition, after-market shifter, Vertigate, etc.
1 each Chrome engine or underhood accessories. Chrome valve covers
After-market gauges (including tach)
Dash altered for after-market gauges
Non-factory type carb
Non-factory type intake manifold
Headers
Incorrect engine color
After-market chrome exhaust tips that differ significantly from factory equipment, or non-factory location
Exterior modifications that significantly alter the appearance of the vehicle (i.e., after-market style scoops, spoilers, air dams, altered or flared wheel openings, tubs, sunroofs, etc.)
.MODIFIED CLASS
The following items will automatically put your vehicle in the Modified Class: bodywork that involves a redesign of the original body lines, including but not limited to nosing, chopping, channeling, sectioning, changing radius of wheel wells, moulding, tunneling, etc. Paint that is of custom design such as painted Graphics, shading, blending, candy, pearl, neon, or murals. Engine relocation and/or custom fabricated engine mounts and/or a different engine than was available with any given entry and/or a smoothed out engine block. Any aftermarket )non stock OEM) multiple carb set-ups, tunnel rams, blowers, turbo chargers and/or late model tuned port-type fuel infection on any other era vehicle. Interiors that are of a custom design that consists of changes to three or more of the following: seats, door panels, dash modifications, flooring, headliner, trunk, or truck bed area. See notes concerning dealer- and factory-sold conversions in Stock Class above.
hope this helps
phils toys