NO it will not FIT.
NO.
No. The bore size is different between a 305 and 350. The 350 bore size is larger.
No. The balance is different, the engine will vibrate.
5.7litres.
4"
To my knowledge the only small block flex plate that doesn't interchange is the small block 400.
350
It probably won't fit, so no. The 350 flexplate is far more common, so just get one of those.
350.
358
a 350 or 327 that is the question. A 350 or a 327