As far as the gap staying at .010 for the hot engine....
The most likely cause is that the adjusting screws are old and have lost their hardness. If you adjust them and give them a little twist the gap is gone as soon as you fire the engine up.
My suggestion is to try new screws they're cheap. Or should I say 'inexpensive' depends on where they are made. Brazil/China/Germany etc..
Also.... Are the rockers stock? The cam may have come with different rockers requiring a different gap.
Conrad W Peden
72 L20E in rust-o
73 L20E in resto. soon to be raced-o
http://members.rennlist.com/a914lover
[This message has been edited by Conrad W Peden (edited 09-21-2000).]