Best way is to find a donor car that is a V8, and yank all the stuff you will need, like pedals, crossmembers, etc. I'm not a Chevy Camaro guy, but the nice thing about Chevy's is that they didn't change a whole lot over the years.

The V8 cars usually have heavier suspension/ brakes, and you are probably going to go the carb route, which makes wiring easier (no computers/ sensors to deal with) . My one Son is building a Capri that was a 4 cylinder car originally, and will now be a 5.0 of some cubic inch displacement (347, 427, who knows until it is built) and we are using alot of V8 stuff, like brakes, etc. Visit a local junkyard, find a stick V8 car, and start stripping what you need. The rear axle will also be a little stronger, maybe, and have deeper gears.

techinspector 1 makes a valid point though, as sometimes it is easier to start with the final version than to create one from scratch.