no
NO. The 86 is not a roller block.
== ==
No they will not.
no they will not
No. The 350 has bigger valves. While you CAN put the 305 heads on the 350, (I can't imagine why you would actually want to) you can NOT put the 350 heads on the 305. Because of the 305's small bore, the valves on the 350 heads will hit the cylinder block.
No, its got a 5.7L V8, 350 vortec
yes ,I have change one out with a old 350 it had lot more power . I used the old heads to with vortec intake you have to slot the four bolt holes .but it will work.
no
no. a 350 block is a 5.7L
Yes they are the same.
Yes they will. The bore is 3.785 so they wont hit