It's very hard to say without taking the head off and looking at them.
Yes they both have 4 inch bores but if the chamber size where the valves is different it will change the compression.
1973 350 Corvette. 76cc chambers. 2.02`` intake valves 1.6`` exhaust valves.
Zero lash then one turn in. (assuming this is a stock Chevy 350)
Yes, but I don't know why you would want to use them on a 350. 305's are limited as far as valve size is concerned because their small bore causes clearance problems with the large valve heads... Larger valves will actually hit the block on a 305. Just about ANY 350 head is better than ANY 305 heads.
As far as I know, all small blocks have adjustable valves. Definitely all small blocks built before the LT1 and LS1.
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.
The 2010 Lexus IS-350 has 24 valves.
The 2011 Lexus IS-350 has 24 valves.
The 2009 Lexus IS-350 has 24 valves.
The 2014 Lexus IS-350 has 24 valves.
The 2007 Lexus IS-350 has 24 valves.
The 2008 Lexus IS-350 has 24 valves.