I had the same problem, talk to Bob Gromm racing, he is in san jose, mine was using
oil, just like yours blowing smoke just one side, I had the umbrella type seals, which didnt work very well, replaced with the snap fit stle that stay down over the guide, problem solved, talk with Bob he is a nice guy.The first thing he is gong to ask you is what your valve guides clearences are, he runs his on the tight side, some engine guys leave alot of clearence there, and with the umbrella style seal, it wont cut it.