recommended oil for '68 383 ?

wtf. are u serious? like we don't have manuals or the manual from '68 is the modern bible on the best motor oil available 50 years later...whatever.

Okay, smartass.
1) Use the forum search function. This subject has been covered extensively, from oil weights to brands.
2) Learn how to formulate an easily understood question.

What I gathered from the subject of the post was you wanted to know what weight oil. The only question I saw was in the subject. The body of the post had nothing but rambling. The service manual is the only thing I can comment on for a recommendation because there are variables (important ones by the way) that you left out of your post.

Important **** to include in your question, none of which was included;
tolerances
flat or roller cam
volume/pressure of oil pump
oiling modifications
crank scraper/windage tray
summer driving only or daily driver
et cetera.

:icon_fU: