72' Duster here.
I was having the block bored at my local machine shop when I spotted a 426 Hemi complete with high stall B&M automatic trans, 671 roots blower and it was the twin distributer (2 sparkplugs per cylinder) racing motor.
They were selling it for the cost of the work done on it. The guy couldn't pay, and the total cost was $2,500.00. I tried and tried to talk my Dad into letting me buy it. He never would relent. Now I understand that my 16 y.o. self + light bodied Duster + 1000 HP engine would have = disaster, but do you have any idea what that motor is worth today?
Oh and for Pars...
340 block, ported and polished heads, 850 Holley, Edelbrock high rise manifold, Hooker headers, Accel distributer, 11-1 compression (kept blowing head gaskets) and a B&M automatic w/high stall torque converter.