340 intake on a 273???

So what's the plan: use the entire pkg in your chassis? Or just the intake on your engine?
The pictures kindof show the smaller bolt-heads and the bolt at the back in the very first picture seems to show the bolt not sitting fully supported by the intake casting.

Me personally, I would not bolt that onto a low-compression,small-port headed 273, especially if it has a bit of a cam. I would find me a small-port aluminum intake. But there are other things I would do before I would bolt a 4bbl on.