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Nothing wrong with a 900 rpm idle. Do you have a wideband o2 sensor? I'm not sure drilling throttle blades is the right thing to do in this case.

So you can get it to lean out now?

If they're 0.034 then make a huge change that way you will know you're on the right track. Try 0.025 and see what happens.

Try 0.035 to 0.40 for the idle restrictors or smaller if needed. Also do you have restrictors installed for the t-slots? It may or may not need them.

Check your vacuum when driving in high gear on a flat stretch. Then choose your PV. And yes, install smaller idle restrictors! Your IAB is good. Also don't worry too much about squaring the transfer slot on the secondaries.

^ I wanted to see if the idle fuel restriction was relocated to the bottom of the block.

I re-read your initial post and am wondering if you have a wideband o2? Also do you have pics of the IFR installed and what's the size of the IABs? I doubt you're pulling fuel from the main circuit unless you can physically see it happen. That circuit shouldn't be active at 1000 rpm.

And there's no way you want a 2.5 power valve on there. Go for a drive with a vacuum gauge and see what the gauge reads on a flat road while cruising in high gear. I bet it's a lot higher that 5" or 7". I'm guessing 12 to 15, so I would try a 10, 9 or 8.5 PV. And no it won't screw up your idle

So have you raised the idle? If you say you can keep it running at 1000 rpm with your foot on the throttle then raise the idle. Make sure the transfer slot is square on the primary side and adjust the secondary so it can idle.

It's about 1.90 a litre right now. Gatineau airport you can bring your fuel jugs and the fuel guy will fill them and Smith's Falls is fill your own pay by credit card. 100 octane with low lead.

I get the AV gas at the Gatineau or at the Smith falls airport. You have to stock up.

100LL for me at 1.90 a litre ! That stuff will run a 13:1 engine no problem.

Being a scientist and all...a wideband o2 sensor might be up your alley.

Personally I just set the primary side and then make small adjustments with the secondary side to set the idle.

With the glass site yes half way up. Older brass plug set up, trickling out. Transition slot is adjusted with your idle adjustment screw. Flip the carb upside down. Open the throttle and you will see the slot. Set the primary side so you can see a perfect square when looking at it from...

Have you checked your transition slot. It should look square on the primary side. Try turning out the idle fuel mixture screws a half turn to see if you're going in the right direction. You may need more initial timing. Make sure there's no delay at the nozzles when applying the throttle...

There's no way you need a 5.5 PV. Not on a combo like that. But changing that won't help with your issue. Always start with checking your timing 1st and go from there.

Jeez there's roads up there in the NWT? Lol!

Try an earlier opening valve or more main jet. That's where I would start.

It's easy to get confused with this stuff. At what rpm is the engine going lean? You said there isn't a change when increasing jet sizes? Main jetting usually comes in around 2300 to 3000rpm. You say it gets better when the engine gets to 6.5 vacuum. Maybe try an 8.5 or 9.5? What's your vacuum...