hey guys, i did the split port swap/4.2L stroke on my 94 cougar. The entire short block was assembled by a local machine shop. here's my question, i have put approx 400miles on this new swap, but i am still blowin oil out my exhaust. im concerned that my valves and rigs aren't seated. is there a visual inspection i can do or does this usually take longer then 400 miles. ive heard several different things, so can anyone help me out???