8.8 swap
carrier has to be snug for the reasons stated in my last post --since you spent the money give it a shot - but it is totally unnecessary to use a case spreader for the 8.8 Ford.
here is a pic of the tool i made to drive the shim home --- it is available from tool suppliers Mac , Snap On etc.--- but a little of your time time and a 1/4 inch thick piece of aluminum,, done.
it has served me well .i have never broken or bent shims while using it on the 100 plus 8.8's , GM 10 and 12 bolt differentials i've built.