Bitchen Duster, Stuart! My little brother had a '70 Duster in Lime Light Green. It had a 318, 904LA automatic trans and a 7-1/4" integral rear axle in when he bought it. We put a 340 with a 'purple shaft" cam in it, a 727A trans that I built a very firm shift valve body for and an 8-3/4 rear end with a 3.55 gear ratio... It was an extremely fun car!...