1970 dart swinger big block $7700.00

Wow...$6000 now. Show me a shot from underneath the car of the rearend, a shot (close-up) of the boss on the front of the motor with numbers/letters on it. If it's a 440 you will see those numbers. The letter in front of it designates the year of it.

What exhaust does it have?

Can you show an interior shot?

For $6000 you could not build this car. If you were smarter, you'd put this car on eBay and get around $10k+ for it with more pictures and a MUCH, MUCH better level of details.

...I would go there, first IMO.