Ok So I am interested in getting a set of individual shaft rockers (t&d)for my original b1 heads. Is spray bar oiling through the valve covers going to be enough for the primary source of oiling to the pushrod cups and rockers? valve spring pressures from 300-350 on the seat and up to 850-900 open at the most. This is going to be a turbo motor and will probably see 8,000 to 8,500 rpm at the highest. Thing is I don't want to pay to have the lifter bores to be bushed and I already have a set of new crane lifters. Right now I have the common shaft t&d setup should I just stick with this?

Thanks, Cody