I wouldn't bother with the Dbilas inlet manifold or cams. been there done that and lost power.
changed to Schrick cams and standard manifold and gained 6bhp top end and another 12bhp through the midrange with 8lbft of torque over the whole range. plus a smoother idle.
We don't have anyone in the UK who can support Dbilas parts or software. Exhaust manifolds are great if they are ported out as the casting is very rough in standard form.