You know, Im just not a big fan of doing things like that. Now that could be because maybe I dont fully understand the benefits or fully see the point, but Ive just never been a fan of such things unless there was very clear benefits.
What I do know, however, is that if you block off coolant flow in the LIM in the way that it is normally done there is a modification you have to make to the LIM coolant bypass or whatever it is called. If you look at the LIM from the drivers side, around where the LIM sits in the lifter valley, you'll see a hump on the LIM that is held on with two bolts. I forgot what it is technically called, but in the middle of that hump is a divider in the LIM that you have a notch out some or blocking off coolant flow in the way it is normally done in the LIM will result in reduced if not restricted coolant flow to the rear bank of cylinders.
Im not saying blocking off the coolant flow in the LIM is a bad thing, I just dont see the need but if you do do that, be sure to modify that area that I mentioned.
There was a guy on here that is not on here quite as frequently as he once was that goes by the screen name Turbocharged400sbc and if you PM him he can probably send you some pics. Im pretty sure I have them but I dont know where they are at right now and if you'll forgive me, Im not horribly motivated to dig around for them, but if you get no response from him I will try to find them.