Originally Posted by techinspector1
They still had to have a full interior and look somewhat streetable. Once you gutted the interior, the car was an Altered.
Gassers did not have to have a full (stock) interiors as such and could be quite spartan. However, the seats, steering etc. had to be in a relatively stock position. Also, as I recall, the frame had to match the body (year & make) but could be reinforced (boxed, roll cage etc.)
The major differences between a gasser and an altered was the allowable engine set-back (10% max for a gasser, 25% max for an altered). The other major difference was that altereds were allowed ANY chassis or chassis modification and seats/steering could be center mounted if desired.