The 250 and 292 sixes use the same clutch and bellhousing as your 283 or other Chevy V-8. So choosing a six instead of V-8 won't solve any issues with clutch linkage.
It does solve the steering box/exhaust interference problem.
Its not clear to me if the 194 was ever installed and working in the truck. If it was, then any clutch issues were already sorted out.
I would not expect a 283 to pull like a long stroke 292, but I'll play tractor pull with my V-8 powered truck against any 292 powered pickup that comes along.
You need to choose the option you'll be happiest with. If the options are the 194 against the 283 I don't think its a contest. If the options are broader, the first consideration is how you want to use the truck and that choice should drive what motor you are looking for.
I have a good running 454 that came in a running truck for free. No its not for sale, but I mention it only to suggest that inexpensive options are out there. I also have a solid 350 (not for sale either) that came in a van I paid $150 for.
Good cheap V-8s are out there. I've seen similar deals on sixes, but haven't dragged any home. Decide how you are going to use it, then look for the right motor for that use.
