You sound like you want a challenge? It's great to see somebody who wants to go another direction than the same old 350/350 combination in a rod.
Your first consideration is to find a passenger side motor mount bracket for the frame. The 292 puts the fuel pump where all the other motors put the mount. Unless I'm not remembering right, the shape of the brackets are a little different, and won't necessarily work by just swapping it forward to the other holes. But give it a try anyways. You may be able to modify the bracket a little by cutting out a section to shorten it. Then use the factory type rubbers mounts for the '69 truck.
Unless you have a line on a donor truck, good luck finding P/S brackets for the 292. The last time I saw any, they were on a '79 3/4 ton. I had to make mine from parts off of mid-70's cars that used the integral head 250. It was a good challenge, and it worked out fine.
The radiators will work fine. Maybe you could save yourself some worry and just buy a new lifetime-guaranteed one for a 292 from your local discount parts house. I really like those lifetime guarantees!!!! Don't bother with a fan shroud. Get a twin-motor electric unit and make brackets to bolt it to the stock shroud mounts. It looks much better and is WAY quieter and smoother.
The torque converters are all interchangeable. All you have to do is bolt the flex plate from the bent8 onto the six. Most of those vintage trucks, especially the 1/2-tons, had small converters anyways. Since you can use the flex plate, you can also use the same starter. The only thing I can think of there is to watch out and not use a 292 block that only has 2 starter mounting holes (really old style from '63). If it only has 2 holes, and the flex plate is a large-diameter type, then you may be drilling and tapping the third offset hole into the block. Then again, if it's a small diameter flexplate, then this discussion is moot anyways.
Something you forgot, though, is how and where you are going to hook up the throttle kickdown for the trans. Give it some thought as to what intake manifold and carburetor you want, and make sure you can connect the kickdown properly. Of course you don't have to have it hooked up, but you can't just remove the cable from the tranny unless you plug the hole. And then you will always have to manually pull down the shifter to downshift the trans. You could always change out the 350 trans for a 400 (no kickdown cable, only a wire), but you'll need to get a different driveshaft.
All of the stock 6-banger exhausts are single pipe. If you want duals, and can find a 3-bolt large-type truck manifold, then you can use a splitter after the manifold. The only other real option is headers. Personally I do not like the sound of 3 cylinders coming out of a pipe. It makes me think of too many gerbils running on their little treadmills. I have always used a 3-bolt manifold and a 2 1/2" pipe running through a single 2 1/2" Flowmaster. With a nice big cam, you would swear that a bent8 is under the hood.
Yeah, buy a new wiring harness or a kit to make your own. Using an old one off a donor usually means the insulation is hard and brittle.
Good luck and give a holler of you have any other questions.
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David
