1974 Dodge Dart Swinger Hardtop engine swap

The engine was dyno'd at the rear wheels, the guy says you add 20% to get what it makes at the flywheel. Also that it has a truck cam in it or something that's good for torque. Also the price of 3900 is for the engine and the tci transmission, which I've seen alone go for 1500. I'll see if the guy will take less for it. I'll see if he has receipts for the transmission and the work for getting the engine bored. Thanks.