So what is the highest HP stroker G3 you guys have seen?

HHP in DE has a few 1k hp n/a strokers under their belts from what I've heard...

Dave Barton ran 8.54@ 157 at 3350lbs with a 426 gen 3 back in 2015. I'm sure you can make more power with no rules. It won't be cheap. Barton had it for sale on here for $50 000.
https://blog.fcanorthamerica.com/2015/10/28/mopar-power-topples-drag-race-records/

To my knowledge Barton's Drag Pak Challenger still has the fastest NA NHRA Stock Eliminator ET ever. On the Wallace Calculator his 8.54 ET @ 157 MPH
(minimum FS/B class weight of 3350) computes to:

Your HP computed from your vehicle ET is 954.30 rear wheel HP and 1,060.33 flywheel HP.
Your HP computed from your vehicle MPH is 910.62 rear wheel HP and 1,011.80 flywheel HP.

Other Gen 3 Hemi NA builds:

814 hp - Modern Muscle Extreme NA build: https://hotrod.staging.enthusiastnetwork.com/articles/build-800hp-6-4l-hemi-no-boost-no-nitrous/

832 hp - bodoboy NA build: https://www.youtube.com/watch?v=XFLi9U-f0w0

882 hp - budoboy NA build: https://www.yellowbullet.com/threads/882-hp-676-tq-from-n-a-gen-3-hemi.1464330/

Someone from Arrington was on one of the 6.4 FB groups saying they have a 900hp N/A 440ci stroker

The W9 guys just posted a +940hp motor.....

And I just saw a Hammer Head Hemi Ford small block post +1100hp...in FSCM

And the +800hp MMX motor didn't seem to live up to the dyno numbers once in the car. I would like to hear more about that one, and what the issue in the car is. I was considering one of those.

Larry Hill recently completed his FS/D 392 Stock Eliminator Drag Pak Challenger. He has run 9.12 @ 145 MPH weighing 3415. Wallace says:

Your HP computed from your vehicle ET is 798.76 rear wheel HP and 887.51 flywheel HP
Your HP computed from your vehicle MPH is 731.29 rear wheel HP and 812.54 flywheel HP

This is with a stock stroke 392.

One other note is that 832 hp and 882 hp motors listed previously were with factory modified heads, not special aftermarket race heads. Pretty impressive.

I heard that MMX wasn't satisfied with the performance of the motor and car as well. I called MMX with a question once and asked for Byron. If you don't know anybody there he does all MMX's YouTube videos and is a very nice guy. He would likely give you the lowdown.