How to assess shift kit type

Hi,
I inherited a TH350 w/manual valve body, but am unsure what shift kit it has.
I have been "advised" a Stage 3 Shift kit is standard upgrade with manual valve body.

Can I drop the pan and inspect the plate/ball/holes to determine what it is? If so what am I looking for?

Also I was advised with my build, and if a Stage 3 Shift kit is in the tranny I could end up putting the car sideways at shifts.
Here is build:
Engine is a .040 over balanced 400 small block
Block is decked and drilled for steam holes
Scat 9000 crank
Scat forged 4130 5.700" Rods, ARP Bolts
Mahle pistons 10:44 compression
Competition valve train
Crane gold full roller rockers
Competition Cam 284xe.
AFR 210 Fully CNC Heads.
Hogged out RPM Air Gap Manifold
Holley 750cfm double pumper
2400 TCI Stall Converter
TH350 transmission with manual valve body
new 5 leaf springs and inboard shocks
3:77 posi with 265/60/15 BFG's - Upgrade to Mickey T Streets in summer.

Your thoughts?
Thanks
1970 Nova  

who is telling you  that....if the car goes sideways at shifts it just makes for a better show... and a lot more fun...

really if it goes sideways.. it means something is wrong with the suspention or tires...


put it together and try it...

in fact... a manual valve body means that you shift the tranny when you want by moving the shifter...

the only thing to look out for is many if not all the time manual valve bodys have a reversed pattern...

like this..
PRN123 instead of


PRN321.

this allows you to shift to third without any chance  of overshifting into N during a drag race.,..

what somebody may be worried about it that if you go to shift to N  you have to slow down and go back through second and first..

what ever put it together and try it.. you can always get another 350 valve body and start over.. with a fresh kit.. and that reverse valve body with the stage 3 kit could be sold or saved for later...