You need to move them [IFR] down to keep them covered in fuel. They may need to fattened up a bit especially with e85.
I've fattened them up to the largest IFR's I could find. It's a purpose built E85 carb, it came with size 46 IFR's factory. I now have size 59's installed which are the largest available in the kit I bought. Is there a brand of metering block you know of that has the IFR location located kin the bottom ?
You don’t need new metering blocks. Drill and tap the lower position and use brass set screws from McMaster-Carr or similar and drill your own jets.
Yep it's easy lots of videos out there. The screws are 6/32. Drill slow with some oil.
I use a pin vice to drill my brass set screws, #6, #8, #10 or larger
No oil though, just hand pressure pressing and slow hand rotation speeds
