Go out and buy a can of "THE RIGHT STUFF"...yes, that is what it is called...It is a black rtv in a cheez-whiz type of pressurized can...Before you use it, just set the intake down on the heads/block and just see how big of a gap is there, then remove the intake and cut the tip so that you will be able to get a bead a little bigger than the gap that was there...
Be warned...Around here it is like $12 a can...