car idles fine but idle speed drops really low in drive/reverse.

I agree you should get the correct tools. Here is something you can try while you wait. Sandwiched between the fuel bowl and the main body of the carb is the metering plate. There should be a adjuster on the drivers and passengers side of the metering block you can turn with a small screw driver.

Start the car up and warm it up to operating temp. Shut the car off. Grab a paper and pencil and write down the changes you make or you could get very lost trying to get back to where you started. I would first back out both of the "idle mixture" screw 1/2 turn. Now write down what you did. Start the car and see how it idles. Drop the car into drive with the brake on and see how it idles. If it is "better", but idle is still low. put the car back in park and shut it off. Repeat the procedure and back out the "idle mixture screws another 1/2 turn. Start the car again and see how it idles in Park and in gear.

I would not go more then one full turn (in or out) with out a tach and vacuum gauge to verify what you are seeing/feeling.

If backing out the screw 1/2 turn makes things worse, then turn the screws back where you found them. Then try tightening the screws 1/2 turn and then test idle in Park and Drive. Make sure you write down every twist of the screws. It is possible turning the screws won't make any difference. In this case put the screws back where you found them and look else where for the source of the problem.