Charlie66, Read this,
https://www.horsepowerinnovations.co...nd-conversions
Booster big hole is about 1/2 inch with 12 smaller holes inside ( don't know sizes )
PVCR is big difference between ours
I believe yes on exposed .078 transition slot
Might want to buy E85 conversion blocks
I believe it's hard to flood with E85, Give bigger jets and squirters/cams a try.
I've raced with E85 for 20 years with purposed built carbs, saved a ton of money, go 8.90 NA, 8.60 with 100 shot for3- 4 sec. Good Luck with your 1050. Rich