Oh let me add I have same kit On3, 76/75 BMF gen 2, race core, no E85, on 13psi changing springs out this weekend. Still 12.2 afr and more fuel left. This is on my 2016 sierra denali 5.3l a6. IMHO turbo is way better than supercharger. More power cheaper also easier on the fuel limit with 5.3l. I have friends that did the whipples and mid 500 was there max. I will push mine past 625 and see if it holds. I have a back up motor if not. SO 15psi of bust.
On3 is great not one issue also thick stainless. Turbo manifold is divided so o2 banks are separate. Only thing I would plan out is spring rate. the BMF flutters my bov. just a 12.95 part.