no they will not
No, the 1992 Chevy 350 (5.7L) V8 is not a Vortec engine.
That's what should be on it.
no
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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 not even close.
You must drill the steam holes in the heads to coincide with the ones in the block or it will overheat QUICK!!!
Yes , but you will need a tbi intake to fit vortec heads if you retain the 90 TBI fuel system.
No. Not without switching the cylinder heads. I think it was 89, Chevy came out with the 1st generation Vortec heads, which require a different intake.
Start in the middle and go in a circle
a 350 is a small block those heads will fit on and Chevy SMALL block not a big block
http://www.customclassictrucks.com/techarticles/0405cct_vortec_cylinder_heads_small_block_chevy/index.html This will answer all your questions. Yes it can be done. There's a bit more to it than just torquing on a new set of heads, but if you can replace heads, you can more than handle the rest of it. Should flow much better than the stock TBI heads. Vortec heads flow far better!