The bellhousing bolt pattern will be different, as the 194 (along with it's 230/250/292 kin) is the same as the V8 engines. doing the swap will be about the same as doing a V8 swap.
To be honest, you will most likely be dissapointed in the performance, as the 194 is underpowered for a truck, especially a 3/4 ton. Something you might consider looking for would be either a 261 (bolt in) or a 250 or 292 (same issues as using the 194, but much more power) along with a '55-'72 manual trans bellhousing.
