An 89 block will be fine; proceed with stock lifters. First post in your thread said 98 model year.
So now, are you looking for a cam with around .500" lift with 1.5 ratio LA rockers, or one with around .500" lift with Magnum 1.6 ratio?
Be careful asking for a Magnum cam as some are not drilled for LA oiling. The oil goes through the camshaft journals. Many of the aftermarket Magnum cams have the oil holes to work with either setup, but most cams reground from a Magnum core won't have them.