You exhaust was smokey, or the engine was smokey? Either way, you're probably alright, because if you blow a hole in your oil pan and shoot your oil pressure all to hell, you're probably gonna have smoke if the oil gets on hot stuff.
But christ man, a cinder block? Those are pretty hefty bastards, I'm surprised you don't need a whole new front end, oil pan, and transmission pan, not to mention numerous small items. If she sounds okay, you're probably alright, but the best way to test is once you get the engine back together, do an oil pressure test. That'll give you an idea of how shot your bearings, etc, are. Pulling the bearings for inspection might not be a bad idea either.
This isn't just directed at you, but everyone: NEVER drive ANY automobile with the oil can lamp on!! The oil level reminder is something else entirely, but the oil can is your oil pressure warning, and if you have no oil pressure, you will cook your engine... no matter how "old school" it may be, its only a matter of time. Its costly abuse that should be avoided always, even if a tow costs you a hundred bucks or more. Think what a new engine might cost you.
Okay, I'm done ranting now. Sorry about that, but man, if that engine comes out clean in the wash, you are one lucky bastard.
Take it easy, and next time, get a tow.