23 or 18 spline?

Yes it will
My combo is similar to yours, except a 367, the car weighs up to 3650/me in it, and sports 295s most days but has worn out a set of 325/50-15 BFG-DRs. I ran a CF-II for a few months but it was too harsh. I replaced the disc with a factory 340 one, and decreased the clamping a bit. The 340 discs only last a summer or maybe two, (spitting the springs out or tearing the hubs out); but IMO are a great street disc.
On the street I find no good reason to powershift. But-um
I have street slick-shifted my 1x23, A833, on Second and Third so it shifts like lightning up to 7200, the highest I have tried. And I installed a gear splitter on the back, that shifts hard enough to bark the tires at 85 mph; and I run 3.55s.
My car has gone 93 in the Eighth@3457 pounds @900ft elevation, which points to about 430 hp.
If my combo don't bust A833s, I seriously doubt yours will.
Here are my Road-gear ratios compared to yours assuming you have the 2.66Low.
Mine; 10.97-8.55-6.82-5.32-4.97-3.88-3.55-2.77 GV in red
yours: 12.13-8.76-6.38-4.56. your ratios suck, lol.
Just Kidding; as you can see, your ratios start out a lil deeper, but both Second and third are neck and neck, but by Fourth, mine is a half a gear better. Of course, I still have 4 gears to go, lol. That don't suck........

At 3200 pounds, you could easily give up some rear gear, unless your CCP is really low. (mine has run up to 195psi) On the street, I would not be afraid to run 3.91s in your combo. My 360 actually likes 3.23 x 3.09= 9.98 . I only run 3.55s cuz 6900 gets me 65mph, with no stick-shifting, I just keep it floored and press the little splitter button@50 mph; the tires never stop spinning, and I challenge anyone to go find where the GVod shifted, lol.
Oh my poor A833, lol.

Now, here are the million dollar questions;
>Exactly which transmission did you break, and
>what exactly did you explode, and
> was it naturally aspirated at the time?
inquiring minds want to know......

BTW, nice car

BTW-2
If yur gonna keep on Power-shifting, you really need to get Dave's (EDIT; I mean Brewer's) street slick-shifted synchronizers. Probably the best modification I did to mine. I still tickle the clutch pedal when NOT splitting gears, and I have to when back-shifting the GVod.......... but you know, I got a 367 lol ..............