AT 55 mph, the stock front wheels on my Coupe will noticeably tamp, and if left uncorrected, the tires will cup. The rear wheels will noticeably tamp at higher speeds because they have more unsprung weight.
You can do a rudimentary wheel balance like this:
> Chock the rear wheels, shift the transmission into 2nd gear and jack the front axle so one wheel is free to spin;
> Remove the free spinning front wheel and loosen the wheel bearing just a tad. The must spin freely;
> Mount a wheel using all 5 lug nuts;
> Spin the wheel, and when it stops make a chalk mark on tire at 6 o'clock and place a corresponding marker on the ground, using a strip of tape;
> Spin the wheel at least 2 more times, marking the tire at the tape strip on the ground each time;
>The marks on the tire indicate the heavy span causing the out-of-balance, so add weight diagonally across the rim, hypothetically at 12 o'clock;
> Repeat the process and adjust the amount of weight added until the wheel spins and stops in random positions.
There are 3 kinds of wheel weights available, clip-on, stick-on and beads that go into the inner tube. The above process is not applicable if you will be using the beads.
Harbor Freight has an inexpensive bubble type wheel balancer, but the hub caps need to be off the wheels to use it. Harbor Freight also has the stick-on wheel weights.
Considering the speeds at which we drive our Model A's, it does not matter which side of the rim you add wheel weights. I prefer the inboard side of the rims, so the weights are not obvious to onlookers.