take them to a machine shop
Yes, and well.
the block & heads are the same you just have to pull the 305 out & put the 350 back in
In the cylinder heads.
Chevy didn't make a 306. A 302, 305, and 307, all of which will work just fine.
Yes, they should fit ok. 305 heads should bump up the compression a little.
Yes they will, but 305 heads have a smaller combustion chamber so it may raise your compression ratio.
The headers for a 350 and 305 are the same.
Is a 2.8 liter engine a 305?
It depends on what heads and ignition system you're using. You'll have better luck with AC plugs in a Chevy.
Yes they will fit , But you will notice no change what soever. ( no more power )
There is no information on the internet about what the special feature of the Chevy 305 engine is, in fact, the Chevy 305 and 350 are interchangeable, one is just an older model.
Possibly if Chevy made a 300.