The 200 shot put it out of the mild build range, safety first I does look like something locked up the gear train, Glad ya didn't get hurt, good lesson for all

Yeah the 200 shot did put it over mild. My buddy sold me the kit for $150 with bottle. I couldn't pass it up. This is what happened the first time the spray hit the engine so I never even got to feel it

We sprayed an old 365 cid build a few years back around 400 hp, started with 200 and broke everything you can think of except the engine, droped back to 125 shot and started to have fun, I have had a 150 hp plate set up on my stroker for the past 3 years and never sprayed, cant keep the thing on the ground with out nos

you do know your ring and pinion is toast, don't you?. been there a few times as well. it sucks.sorry.

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your joking right?

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No, not at all, it would have sucked even worse if it were a numbers combo, why do you feel it's such a question?

Anyway.....I didn't realize it was an aluminum case trans, those can flex and fail allot easier than an iron case trans, you may find that was the cause of the carnage.

Looks like it broke a tooth in the trans and it got caught in between a drive(speed gear) and the cluster...I.ve seen that a couple of times over the years.

I agree it's wise to slowly & carefully disassemble the trans, and take a very close look at the rearend. I've broken 4-speeds in a '57 Chevy and the trans looked like yours: as though someone yanked down on it to tear it out of the car. Cause was '55-'57 Chevys lack a rear crossmember, and wheel hop would break 2 or more ears off at the bellhousing. Your trans does not appear to have spun to break the ears, but looks like the tailshaft was tearing the trans out. Seems to me the driveshaft is a big clue. Rotation of the driveshaft tear has meaning, as one observant poster has already pointed out. You'd be wise to check the bearings & crank endplay too.
Put a proper bellhousing in that thing!

I had the same kind of thing happen years ago in my 69 Road Runner. I was going about 100+ mph when all hell broke loose, the drive shaft came apart at the front u-joint causing damage to the floor-(still to this day I dont know how the car didnt flip) and the shifter to fall to the floor. Once I inspected it the input shaft had broken off at the trans case and was still in the block,all the mounting bolts for the bellhousing were broken off. The only thing that kept the trans in the car was the fact that I had a shifter for a console that has the bend in the handle and it caught the floor. I got a new trans,drive shaft and bought a Lakewood scatter shield,but the rear end never sustained any damage. If I was you I would look into some saftey items for the rebuild. One more thing I forgot was I believe that my pilot bearing was the cause in the fact that there was nothing left of it and caused the severe vibration. Im sorry to see it took your block out also. Good luck with it.