The battery ground wire runs from the battery to the engine block.
No
The negative battery cable is grounded to the battery tray and engine, close to the starter on the block. It's not a real great ground system but, its all you need if you can keep the battery tray connection clean.
On the engine block. where on engine block?
The positive cable goes to the starter. The negative cable bolts to the engine block.
The small block chevy turns in a clockwise rotation.
no
It should be bolted to the engine block anywhere you can put it. Make sure it is on cast iron.
The block heater cord is on the Engine Block Heater on the 2007 Chevy Optra.
its Chevy 454 Big Block Engine
No.
The battery is in the Right-Front corner of the engine compartment, under the main fuse block and the cross-bar. It can be a pain to get to and be careful when replacing it. I have included a link to a site that shows pictures of the battery and several other engine compartment pictures. Good Luck