Forced Induction - ly6 vs lq4 for boost??

which motor will make more peak power w. an s475 with a t4 flange considering both motors have the following mods which one will make more power? id imagine the ly6 due to the l92 heads but im not sure motor will run on e85

-Custom grind boost cam
-stock rockers w/ trunnion upgrade
-comp valve springs
-LS9 head Gaskets
-ARP Head Studs
-ARP Rod Bolts
-double roller timing chain
-Ls7 lifters
-Chromoly pushrods
-holley intake w/ fuel rails
-102mm TB
-120# injectors
- -10an fuel lines
-a1000 fuel pump

s475 turbo
BIG intercooler w/ 3in piping
Tial 44mm wastegate
ebay blow off valve

vehicle weight is 2300#'s so i rlly only need 675 wheel to get high 8's but i would like over 7 for security
looking for a 750 whp setup i know it can be done with the lq4 just curious if the LY6 is a substantial power improvement or not i already have alot of these parts just seeing which motor is better before i chose,

deff go with the ly6..stronger bottom end.. and l92 heads will make some serouis power.. only down fall is there thin deck..but with ur gaskets and head studs i wouldnt worry about it. id go with ly6 anyday... if your worried bout the heads .just slap the 317s on the ly6..but personally id keep the l92's