Can you put 202 corvette heads on a semi stock 305?

No, you can't directly put 202 Corvette heads on a semi-stock 305 small-block Chevy engine. The 202 Corvette heads (from the 1980s) are designed for the smaller displacement 202 cubic inch engine, and they have significantly different bolt patterns, valve sizes, and chamber volumes than the heads designed for the 305. Attempting to force them on would require extensive and likely impossible modifications, making it impractical and not worthwhile. You'd need heads specifically designed for a 305 or a very close compatible small-block Chevy.