One problem with ready rod/all thread. It rust quickly, and in however long of a time, it will seize up in your manifold. Also, when you combine disimilar metals, such a other types of metals for nuts, you can get a compatibally problem, and galvinitc (sp?) corrosion can make the metal rot like a cheap peice of pine wood.

To complcate matters even more, the carburator is--alas--another alloy thrown into the equastion, so you can end up with a multi level disaster by using whatever fasteners you scrounge up.

I'm not a metalurigist--just a wrencher that doesn't have much creases on the knuckel skin. Those long bolts are some type of metal/alloy/whatever the two dollar term. They are not just off-the-shelf fasteners.

Do as 69racer says: Go to the bone yard. Also, you can probally order them from your local GM house. (You want to be careful going to a nut/bolt/fastener house because the counterman may not know what metals are compatible.

Yeah, GM will be a heck of a lot more expensive, probally $5 to $10 a bolt compared to correct 15-cent-bolt. The thing is that when you beat the GM system, you need to make sure that it's the correct type of metal. Too me, I'd rather have peice of mind and find the correct salvage or give GM the overinflated $20 bucks.

Another good option: With all these pack-rats around here, someone ought to have the correct bolts laying around by the bucket load.