Buick 350 engine

I have a 1979 buick 350 block, I used 1972 heads for a build. After assembly and when filling radiator prior to engine start water is coming out on both sides of motor half way back right on lower edge between block and head. We used the fel pro gaskets from our kit. Did we have wrong gasket or ? Please help were lost. Thanks, Bobby

It's a block/head incompatibility. You may need to block off one of the core holes.

http://www.v8buick.com/index.php?thr....139982/page-2

Make sure the head gasket is on right.