If it smokes more than a short time after start up it will Probly be a waste of time. Valve guides bad enough to smoke constantly will not let the valves seat properly. If it smokes all the time it is Probly gummed up or bad oil rings.
 
Does it just smoke on start up or all the time?
When you installed the new engine kit did you have the valves ground?
 
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.
 
New valve guides, or knurl the old ones. Not many knurlers out there, any more, more cost effective to put in new guides.
 
Not rebuilding the head is questionable practice at best, so is playing guessing game for problem.
First thing I would do is unhook the air cleaner and try it. Most are plugged up and few get cleaned properly.
Second thing I would do is examine the spark plugs to see if oiling is across the board or from certain cylinders. Then I would remove manifold and look in the ports. If the smoke is being caused by seepage past the stems it is going to show up as some VERY wet valve stems. There is always going to be some signs of light oiling on the intakes but none should be wet with oil. Exhausts will be dry looking if everything is OK. I would recondition the head instead of fooling with seals for the reasons others stated. I have seen some pretty sloppy heads that didn"t cause smoke in alarming amounts. If you find no oil on the valve stems then you going to be back into the engine to find out what is messed up with the rings.
 
were the liners honed and preped so the rings would seat and wear in ? Ring or two installed upside down or broken might also cause burning.
 

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