No but they make plenty of Hemi heads for the Chevy and some even better. Hemispherical combustion chambers only benefit so much. I beleive the vortex has them. if you like the plug placement, enginers have been arguing about that for years, all just agree it needs to be exhaust valve.
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
no you cannot they are not interchangeable the 89 heads are fuel injected heads and the 79 are carb heads and will not interchange
No.
the heads should fit as long as your not trying to put them on a big block
yes just get head gaskets for the 350 not the 327
You can put Oldsmobile 350 heads on an Oldsmobile 307, if the 307 is 1984 or older. It will take some work but it can be done, I know for a fact that it can, because my 307 has 350 heads on it. It runs great. I'm not sure about the cam though.
some heads are vis versa
yes
Yes you can
yes they will fit, but you will need an intake manifold compatible with vortec heads if you plan on reusing the carburetor
yes