Need manual transmission recommendation

[freak]

I'm just starting my 72 c10 rebuild. I had a 350/350 in it but want to convert to a stick shift. The truck will be a driver but won't be worked. I have another truck for work. I have several 350's sitting around but I'm toying with the idea of re-powering with a 6.2. This won't be a racer. I don't need huge horsepower. Either engine will have a few upgrades however. Fuel economy is important to I can frequently drive it on my 30 minute commute. So for each engine, the gas and diesel, which manual tranny do you recommend? Be specific if you can because I'm looking to purchase soon. Thanks!