I’d be interested to know what the elevation of the dyno shop is, as well as the weather conditions for that day.
Not that those would have much impact on the corrected numbers.
However based on the fuel flow and bsfc numbers there was a fairly decent correction factor being applied.
(Looks like the uncorrected peak power would have been in the 520’s)
The bsfc numbers are pretty decent, so it’s not like the motor was using tons of fuel and not making power with it.
It just wasn’t using much fuel......... so there isn’t going to be big power being made.
The effective rocker ratio after the B3 kit installation looks like it works out to 1.435.
If the manifold isn’t ported, there is some power left on the table there.
At this point, I think the first thing is to see if you can get a cranking compression test.
If you go in with the inspection camera, see if you can get a look at the piston CH situation with the piston at tdc.
One thing that stands out to me is the peak TQ number is rather low for the sum of those parts.
So, the power starts out on the low side, and never really turns that around, so you end up with low-ish HP.
What fuel was used?
30* timing seems really low to me.