Well.....
L98 heads are horrible
The LT1 manifold is also restrictive, and runners are more in kind with a Vic Jr, so ram effect on the intake.
and your cam is pretty small.
The LT4, with only slightly worse exhaust, much better heads, a better intake, and 1 size smaller cam, made 330hp.
A ZZ4 with a similiar sized cam, a better intake and uncapped 1.75" headers makes 355.
L98 heads are horrible
The LT1 manifold is also restrictive, and runners are more in kind with a Vic Jr, so ram effect on the intake.
and your cam is pretty small.
The LT4, with only slightly worse exhaust, much better heads, a better intake, and 1 size smaller cam, made 330hp.
A ZZ4 with a similiar sized cam, a better intake and uncapped 1.75" headers makes 355.