Has anyone bought a cylinder head from one of those 'autozone,Pep boys,Advance Auto,Kragen Auto,etc.? i was looking at a cylinder head for a 1980 200 I6,Advance Auto has them for 279.00 with exchange,they have new valves,rockers,seats,and valve springs.i was wondering if they actually measure twice and cut once with the machining,and do they do a good job in general with parts like that? i've heard a couple of horror stories about parts stores getting heads with too much shaved off,1 maybe 2 valves of a different size than the others,stuff like that. it cost me 210.00 for a guy just to ream the valve guides and do a valve job on a 200 head,the head gasket was another 25 bucks