I can feel your pain... I used to live in Canada and now live in France. And yes, you will have to order many parts from the states. Although, for regular maintenance parts, ordering in the US from a big place like Rockauto really is pretty cheap...
It is usually (pretty much always!) cheaper to buy a complete car that needs few parts than to start from a car that needs many things: the total of the parts is pretty much always more expensive than the car with all the parts on it. So maybe you need to re-think your project.
Putting a '67 Camaro on a LeMans chassis seems like a goofy idea, they are probably not even the same width/length... That would involve a lot of work, as mentionned earlier. And I have a hard time seeing the finish thing looking good (although I really love that yellow Camaro posted by Crispy!).
Obviously you are not concerned about keeping your Camaro numbers matching, and since you consider a chassis swap, you can fabricate, so time to think outside the box: maybe you can find locally a running (but wrecked or rusted) US car to get all the running gear, and maybe wheels, shocks, exhaust, gas tank...
Then for the interior, look into creating your own: some front seats from a (big) local car, you could create a whole interior in aluminium sheet (door panels, rear shelf, floor, dashboard even...). Use aftermarket gauges for your custom dashboard.
Or get a complete/running car...
You will need to order a certain number of Camaro parts from the US anyway you go, though...