No it is not.
no
NO. The 86 is not a roller block.
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 they will not.
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no they will not
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
Yes, 350 Vortec heads can fit on a 305 Vortec block, as both are part of the small-block Chevy family and share similar bolt patterns. However, it's important to note that the compression ratio may change, and the engine's performance characteristics will be different due to the variation in displacement. Additionally, you should ensure that the intake manifold is compatible with the combination of heads and block being used.
no. a 350 block is a 5.7L
Yes they are the same.