Wow that is a good price for the mk2 heater matrix. Even though I already bought mine I checked and they don't seem to do MK1's? Anyway hope it goes well. I would pressure test it before fitting.
Your drawing looks okay to me Mark. Just make sure that nothing vents to atmosphere (ie from the rocker cover) .
In NSW the blue slip is where you generally get pulled up for a charcoal canister. If it was fitted OEM with that engine configuration then it generally has to be there.
Depending on the person doing the slip, seeing the canister in the engine bay will suffice as long as your not pumping sump vapours to atmosphere.
Also would I be correct in saying, keep an eye on the catch can in case it decides to fill with oil and send it to intake runner #4?
There you go with actually testing various setups on a dyno. Though he did not discuss jetting etc which you would have to assume is pretty close for all setups tested. Really not much in it. I listened twice just for that beautiful sound