i understand you want a 5 or 6spd... now you want to kno what trannys bolt up to a 350? all gm trannys will bolt to it... your question is very plain. explain more. but you can use a T-5 but in stock form i wouldnt throw more than 300hp at it. and for a 6spd you would use a T-56 which is good for bout 400hp.