Thy twas watching the hours pass by til my freedom...mothers day a.k.a. Fathers Prison Day...lol
There are several ways to go about this. One very innovative way I seen, if you access to machining equipment (bridgeport)
see here:
http://ls1tech.com/forums/forced-ind...manifolds.html
As for cutting/welding them. YES!!! you need to preheat them to weld. You can just tack them on without heating, but when your old man lays down those dimes.. he should defintly heat them up. Just lop off the flanges, you can put a bit of angle on them if you want to position the vband but remember, more angle you put on the cut, will result in a oval opening. If your father is experienced welder, he will know which rod to use also.
I would use stainless vband & weld it with 309 rod.
heat mani up to 300* , weld it, than back in the oven for 20min @ 300*, than turn off oven and let cool down slowly.
Enjoy!!!