need help! I don't know nothin' about gears!

I have a 74 scamp with a 340 swapped in it and I'm wondering why I'm going slow.

- edelbrock 4bbl, not sure what cfm
- magnum cam
- Accel super stack coil
- edelbrock performer rpm intake
- it's one of them low compression 340's.

currently have a tf727 but plan on swapping for a 4 speed manual.

rear end sucks. all I know is that it's tiny, and the motor screams but the car doesnt want to go anywhere and she spins the one wheel wonder, the one tire fire, whatever you wanna call it.

I wanna spin both wheels and actually get somewhere. slowly building the car for either 1/4 or 1/8 while still cruising on the weekends.

I know this isn't alot of info, but it's difficult to ask about tech when you don't know what to ask. so any help you can give is greatly appreciated. currently talking to another member about getting an 8 1/4 complete rear minus gears.