Manual 4spd Tranny Options

[epthree04]

I have a 4spd with a granny gear on my 70 chevy with a 350 and 4barrel carb. the tranny right now is kinda lame for everyday driving and i want a different option without having to get a new driveshaft. i was thinking of getting a saginaw 4spd but i heard that i will need a shorter driveshaft. also i dont care about the location of the shifter really but i dont want it so far back to hit my bench seat. i am totally new to the older trucks. i was into sport compacts since i was 13. so thanks for the help!