Torque wrench? Just a normal socket wrench with a long-series socket (don't know why the main studs are over-length), nipped up "nice and tight" by hand has always worked for me.
I found that the OEM M8 flange nuts are quick-rust items, (except the two inside the rocker box), good candidates for stainless steel replacements, grab another couple for the exhaust flange while you're about it.
The exhaust ports on all the Electra heads I have seen are terrible, with a lot less to do on the inlet (and very tempting to take it out to 36mm at the flange, I have yielded on several occasions).
However, the worst feature seems to be where the inner parts of the underside of the valve seats actually stick out into the ports, there's still enough metal in the casting to support them, but it just seems all wrong, and I can't see it helping performance any. The answer is probably one of Ace's re-worked heads if you have the $$$.
A.