any opinions on trannies to go with?

[4x4s4allie]

so, here i sit ... i've got a '68 c10 ... starts up, runs, but doesn't drive anywhere, i got it with the transmission disconnected and missing all of the linkages ... so ... here's where i need a little help ...

take out the saginaw 3spd column shift i have in my new '67 and put it in to get it running ...

put in the th350 i have lying around and play with driveshafts

get a th400 to put in it which would have been a stock tranny ...

i'm not as familiar with these transmissions OR trucks ... i know what some of ya'll suggest, i just need to get it running and moving with the little dinky 250 motor in it to get it to the shop to get the body work done ... i've got a 350 to rebuild for it, and i'm still deciding on whether to rebuild the NV4500 i got and do the adaption for it, or just get a 4spd ...

for the time being, any suggestions???