i fried my piston ring in cylinder number 2 and was burning oil awhile back.. I got the block bored .25 over with new jdm itr pistons and rings and got the head redone with new seals. today i finally got it started today and everything was fine.. took it for a test ride around the block and came to find out that i was leaking oil between the head and motor and also notice a little amount of white smoke coming from the exhaust after about 5 minutes of driving. my question is did i do something wrong when installing the head gasket?? i did everything according to the helms book.. i just want to hear some thoughts and advise before i go back and pull off the head again. almost forgot the oil only leaks out when i'm driving not at idle. thanks in advance..

my setup
b18c1
jdm itr piston
dc 4 to 1 header
intake and exhaust