Umm.... People put 1g blocks in 2g cars all the time. If you are wondering how you can do it, check
www.vfaq.com
The blocks are different yes. They are known as 6 bolt and 7 bolt blocks. No one was talking about the crank. 6 bolt cranks go with 6 bolt blocks, 7 bolt cranks go with 7 bolt blocks. Enough said.