I'm a big fan of tunnel rams, although not that involved with small blocks. I really liked the old 660 center squirters when I ran a 440 cube 440 block and Weiand TR. My new build is a 500 cube 440 with a TRE sheet metal manifold and 2 850's with the choke horns milled off. If you get the 660's look for the version with both front and rear metering blocks. The later ones had a metering plate style (4160).