1970 2-bbl Carter rebuild tips / things to watch or check for a first timer.

Clean, Clean and then clean.
Protect your eyes, face and hands.
Spray the cleaner through every passage and orifice you can. Protect your eyes.
Blow it out with air if you have. Little cans of air are OK if you have. Protect your eyes.
On metal parts - no rubber or plastic at all - I sometimes rinse with a quick drying solvent - like brake or electric cleaner.
If dirt or varnish is on anything internal - that is places fuel sits or flows, don't worry much about the throttle plates and venturies - keep cleaning.

Set the float, choke, etc on the factory specs rather than the little sheet when ever there is a question.
I believe '70 is an emissions carb. Idle mix adjustment may be done with an air bleed screw instead of a fuel mix screw.
The fuel mix screws may be sealed or held within a range by some method. Check the FSM, MTSC and TSBs for your year and carb. If its the second year of use, check the year before. That stuff was changing pretty fast those years (67- early 70s).

One more tip. If you must use teflon tape on an NPT fuel fitting, use 1 1/4 to 1 1/2 wraps, and make sure none is in front of the first thread. Don't want any bits of teflon or anything else in the fuel system.