I've got a 1978 camaro that i'm working on currently. Running a 350/V8 with a TH350, but want to convert to a manual. What types of maual trannies can i run with this????

 

Depends on whether you want to bolt it all in, or do some conversions. Either way you'll need the clutch pedal assembly, and all the pieces to work with it. The trans that bolt right up to a factory bellhousing are the four speed Muncie M20, M21, M22, Borg Warner, T10, Super T10, and of course the lowly BW 3 speed.
Some people go for the T-5 from 3rd gen Camaros if you aren't going to hotrod it, or the T56 from 4th gen Camaros if you want more strength than the T5. Both require some extra work to fit, move the crossmember, and adapt the clutch setup.