So you want 2 go Big block...Read this first!

Some have had luck with B or E body headers, some don't.
Some have luck with HP big block manifolds from other cars, some don't.
Exhaust seems cheap for you up north, but Scummit Racing, sells a 3" dual header system with mufflers for 249.95 so it is a realistic number for those of us in the states.

Either way it is the most honest post for BB conversions I have seen.