I seem to think the integral Cyl heads are lighter casting and have a tendency to crack much more than any other cyl heads for the 194- 292 engines. Also the Brazilian 12 port heads are thin castings and tend to crack. Turbo6 here on the BB blew out the complete combustion chamber on the 12 port Brazilian head, IIRC.
One better thing I seem to remember about the integral cyl head, they have a better short turn radius. The combustion chamber is not really any better than the standard larger chamber heads.
If you where to add metal to the chamber and make it look like the newer Chevy Vortec V-6 & V-8 heads 1996 and newer ( heart shape chambers) now your talking about an improvement.
MBHD
