i have encountered these problem with two different issues of the 71 duster kit s
the current round 2 amt 71 duster 340 and the older amt/ertl 71 duster street machine kit
the dash seems to be to wide for the interior side panels and the rear axel/drive train bows when you glue the two halves together and the suspension bars do not fit right once you trim and sand the one half down so it fits the other half without bowing
also on just the current issue amt 71 duster 340 kit the engine front plate fan and fan belt do not fit right with the radiator
i do wish the 71 duster has the same type of interior pan and chassis as the round 2 mpc 80 volare kit and the 75 and 76 dart sport kits have