smoke after rebuild of top end

[supraspaz]

ok new to the world of supra (more experienced in chevy n triumph ) so usual suspects of bhg. she is a 87 7m-ge 5-speed - well tear down n rebuild of top end in three days. ( when i get on a project i keep on it , sometimes bad ) just hopeing this is not one of the times it's bad. anywho cleaned everything really really really good (parts washer hehehe ) replaced all gaskets except cam seals n egr box ( cover with 8 bolts ) stock gasket kit was used ... but after start up all was well ... on test drive the familar smoke was back but not as bad ... is this a possibality of a warpped head ? ( no it was not sent to a shop to be re-worked ) is their anything else that would cause smoke in the exhaust like that ?
sorry for odd n maybe simple questions ... just n unknown territory

thanks