With 650s, you'll never come close to fuel cut with an SAFC a 350whp goal. Considering how much correction an SAFC has to make to the airflow curve. He'll be pushed far away from fuel cut wth the low IDC 650s can allow at 320-350whp. ShapeGSX (one of the very first e3 16g cars in the 11s) ran several 380+whp trap speeds (best of
117.5mph a full weight => 400whp) and was pushing
his 660s to 84% with a bit higher horsepower than the top of your range. Shape's setup (stock shortblock, FMIC, 272s/fp2s, stock head/intake) pushing That idc with 660s comes to arond .52-.53 brake specific fuel consumption with his tune slighly on the lean side.
With PTE 660s, I've pushed a small 16g to 36lbs/min and seen 78% IDC. And I've pushed a td05h 18g to 38lbs/min and seen 83% IDC. These lb/min numbers are what your 350whp goal likely will be needing airflow wise. I've also seen 52% IDC with 1000cc at 35.8 lbs/min with a small 16g. 52% of 1000cc is dead nuts with 80% of 650s.
Try to meet your goal with the safc you already have, 650s, and a logger. How big is your greddy intercooler?