SMALL CHEVY CANTED VALVES
This is a simple question, and the simple answer is no you can't physically bolt big block chevy heads to a small chevy block.
There have been experimental canted valve heads developed for the small block chevy, extensively tested by Smokey Yunick. His conclusion was that they really didn't deliver the extra power they were expecting, and the development was scrapped.
I have built 90 degree Chevrolet V-6s equipped with canted valves, but when the 18 degree stuff hit the market, it made them kind old news. The SB2 stuff now commonly used as the top dog small Chevy head right now is the ultimate power builder available, and about as close as you will get to porcupine heads for your mouse (at least what is readily availabe.)