You can try the valve seals to see if it stops the smoking but if you put in new valve guides and valves you will not want seals on the valves. the seals will inhibit the proper lube of the valve stems. Valve guides are not all that expensive at NAPA and would give you the same results.
You might be farther ahead just biting the built and have the head re worked.
Did you place the rings down in the sleeves and check the end gap of each ring before placing them on the piston? Could you have cracked a ring while installing them on the pistons?
A new engine kit will cause more suction on the valve guides but still the guides would have to be in real bad shape to cause it to smoke all the time bad.