Linc, pulp is fine to use as the datsun a series engines have stainlees steel valves and hardend seats standard, so there is no need to panic about burning valves or seats, but the
standard valve stem guides should really be replaced with k-lines, these valve guides are made for use with unleaded. The standard guides will be ok for fair while but they will wear
and you will notice blue smoke when at idle and just taking off like when the valve stem seals are stuffed.
Josh