I need instructions of setting valve lash on 1965 273 2bbl

.003
That is to say the factory lash is .010/.020
I set them to .013/.023 at about 68*F give or take, to get that hot setting.
The ol' slanty is pretty sensitive on the intake side. .010 at 68* was too tight, she wouldn't idle right once warmed up.
On the exhaust side she was not sensitive ; running just fine at .003 too tight, that is to say .017 hot.