Slant 6 engine and transmission

I picked up a '73 Duster with a slant 6 drivetrain. I'm planning on pulling this and replacing it with a V8 setup. I did here it fire so it's a runable drivetrain if someone needs one. I'll also be getting rid of the 7 1/4 rearend as well. Motor and trans are still in car will have to pull. I'm not sure if this is the original motor for this car, it has a 2 barrel intake and carb on it. I'll start out at $250 for motor and trans/make offer, or trade for other Mopar related items. I'm located outside of Buffalo, NY. Pickup only.