alright, so my buddy decided to go with the 351 heads. they are ported on the exhaust side, 60cc chambers. hes got a set of springs, a set guid plates, studs and now hes lookin at rockers. he thinks he wants to go with the 1.7 instead of the 1.6. anyone have any thoughts? little worried about piston to valve. its got the e303 so its .498 lift. anyone else run the 1.7s?