New oils with less ZDDP.

Hi all:
Can anyone shed some light on this?
They say that the new oils with a higher spec API rating of SL and SM have been modified to have less ZDDP which is very good anti wear additive for metal to metal rubing surfaces such as cam lobes and lifters. Since I still run dinasaur valve train (and most of all others do too) I require that additive in the oil. I have read some info on the net about reduced amounts of ZDDP have been introduced so to cut emissions and stop catatytic poisoning. If this is true, What oil would be best for these old small block v8's. I always thought the latest is the greatest when it came to oils. Any one with direction about this?
Billy D...