It doesn't sound bad but I don't think you will have to run that high of a lobe with those heads. I am not very experienced with TW heads but i understand that they have a good ridge between the intake and exhaust, thus elliminating the need for a high lobe. I suggest you call Total Engine Airflow to confirm. I may be wrong. Those guys can get you on the right track. Let me know what they say if you talk to them.