8psi is very low - I was making 15psi with the same spec as you on a 1341cc bottom end with a healthy charger. It dropped to 12psi with a different worn one.
The 132cc extra swept volume you've got shouldn't restrict you to only 8psi - I'd have thought around 13psi would've been more like it.
Could be the charger, or could be something more simple like a boost leak?
Given your boost level I think the power was pretty good. Barney's old 1341cc G40 with everything done to it made 160bhp running stock (7psi ish) boost levels, so with the extra cc I reckon 167bhp is fair. His made over 190bhp at Aldon once it had a smaller pulley on it!
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Was pleased with my 165bhp @ 14psi, it'd made 175bhp @ 17psi at Emerald, so I think the numbers are about right.
Since fixing a leaking manifold/turbo my Emerald boost control map had completely gone to pot, so I pretty much ended up mashing some numbers in and hoping for the best.
Need some time on a dyno to bring my 'normal' map back up to 17psi and sort out my proper map for 21psi so I can keep up with Yoof...