WHAT IS THE DIFFERENCE BETWEEN A 1965 IMPALA 327 SB ENGINE AND A CORVETTE 327 SB? WHAT WOULD I HAVE TO DO TO AN IMPALA 1965 327 SB ENGINE TO MAKE IT COMPARIBLE OR BETTER THAN A 327 CORVETTE 327 SB? WOULD I HAVE TO CHANGE TO PISTONS, HEADS, ..ETC... AND IS THE CRANK SHAFT THE SAME? ANY ADVICE WOULD HELP.