I went 13;22 on a S port clone never dynoed it and a ported intake 70mm tb ported heads ,
89 5 spd cam cut 50k on bottom of lobes 42 lbs inj ported exh manifolds stock ic stock top and 15% od to blower via crank pully and jackshaft pully,
using stock 92 maf with center post cut and sample drilled to 15/32 and a bolt installed to adjust air flow to sample tube hey it worked and passed so calif smog like this . S port is a very mild porting of newer blower . no welding needed .
the heads i where its at with out ported heads its hard to make power and cam choice id go with the 509 cam wish i had mine was to tame .