Be it my personal opinion, but unless you are autocrossing it and revving hard, dropping RPM then revving hard for hours on end stock normal blended or full synthetic oil (the group 3+4 variety) is best.
Brands Vary but... Liquidmolly, Royal purple and such are GREAT oils but our blocks run such low rpms we don't have to worry as much about in terms of shearing etc ... but that's my arm-chair opinion so table salt and all that