ked

rop, then I'd suggest some focused reading...
Paul Frere's "Porsche 911 Story"
Bruce Anderson's "911 Performance Handbook"
Leffingwell's "Perfection by Design"
Zimmerman's & Leffingwell's buyers guides
& of course, considering the range of Porsches you own, Ludvigsen's "Excellence Was Expected"
also, wander around (join) the Early 911S Registry site...
http://www.early911sregistry.org/