Hello Everyone
On trying to decide what turbo to purchase from this thread *click*, I ended up purchasing the Bloch 2.0 XTR Ball Bearing with the porting option.
I finally got the turbo dialed in via a Flex Fuel e-tune by Christian at Pure Drive Performance. Great tuning experience with him.

He had tuned this vehicle for the prior owner years ago on the stock turbo. The only mods I added on top of the previous tune were the turbo, ported OEM exhaust manifold, ETS 3" SD Intake, ETS Upper IC Short Route Piping, Tial QRJ Vented, FIC 1650 Injectors and a BPR Double Pumper with a Single Walbroh 450.
I also asked Christian to lay over a log with the current tune 91 tune vs the old stock turbo tune.Both were at 25 PSI
E-85 Boost was at high 28psi, touched 29 for a smidge tapering down to 24 up top on an OEM supplied wastegate by Blouch

We kept it safe enough for the stock block and the stock 6 speed.
It spools up fast and pulls hard. I am happy with the results, especially for a stock appearing turbo!

Stock Turbo E-Tune Mods: stock turbo on 91 pump with ETS FMIC, ETS lower pipe, AEM Intake, Stock Upper IC pipes, Stock BPV, Titek o2 3" DP, Buschur 3" exhaust, Cosworth M2 Cams with springs, GM 3-port, Walbroh 255, FIC 1050 injectors

Current Mods:
Stock Block, Stock 6 Speed Trans
Blouch 2.0 XTR Ball Bearing Turbo Ported
Cosworth M2 Cams with Supertech Springs and Retainers
ARP Headstuds
ETS 3.5 FMIC
ETS Full Short Route Piping
ETS 3" SD Intake
Tial QRJ
Titek o2 Housing & Downpipe
FIC 1650 Hi-Z
AMS Fuel Rail
Spoolin Up resistor bypass
Spoolin Up SD harness
BPR Double Pumper with a single Walbroh 450
GM 3-Port
Omni 4-Bar Map Sensor
GM/Innovate Flex Fuel Sensor
Comp Clutch Stage 2

Old 91 OEM turbo tune vs new 91 Blouch 2.0 XTR



Bouch XTR 2.0 Results 91 & E85

 

Looks like fun.
May want to dial the boost or timing below 4000-4500 to keep the rods happy. Alot of people dial the power up after 5000 on stock rods and live awhile.
High load at low rpm is hard on things.

 

Nice results. Your torque in 4th ramps up really aggressively. Did you discuss that with your tuner?

 

Good numbers and it looks like a blast but I'll third what the others have said, may want to tone down the torque to below 400 ft-lbs and ramp it in in the upper rpms.
Its all a blast until there is a window in the block.