i have 68 camaro with a 350 from summit racing but I'm not sure what transmissions for the car

 

What model Camaro and when you say 350 do you mean the engine or the trans?
Depending on the model there's a wide variety of trannys that came in '68 Camaros,3 speed stick,a couple of different 4 speed sticks Saginaw or the stronger Muncie either M20,M21 or M22,2 speed Powerglide autos,3 speed Turbo 350 and Turbo 400 autos.
Does it have a trans in it now or is this a project you need one for?