I know the small block matched up, but wouldn't you like to know why they put in a 327 and not another 302?!?
If you like the car (and paid a fair price) then you are not crazy. When you drive down the road on a sunny day and everyone gives you a second look, you'll at least know there are a lot of folks who love a Camaro --Z, matching #s, or not!
Good luck on the restoration... Happy motoring!