vortec heads -- issues

[Volvo_Matt]

I just purchased a set of vortec cast iron heads listed for 1994 - 1996 chevy impala SS LT1 and were also used on police vehicles. I noticed that on the intake runner side that there are no water jacket ports at the ends of the heads like the old style ones that I used to have. I also cannot figure out which edelbrock performer RPM intake manifold that it uses...I ordered the 7116, which is listed for 1996- vortec heads. This manifold has 8 hold down bolts and these heads have 12 hold-down bolts and use center bolts for the valve covers. Any info. and pics would be greatly appreciated.