If you use a JZA80 Supra engine it will be pretty close to bolt in, they have the same sump and engine mounts. A few people have put Soarer V8's in Supras and it pretty much just slots in.
Is it worth it? Well you'll basically wind up with a heavier RZ Supra for about the same price as an RZ Supra, so you decide.
How much? How long is a piece of string? A JZA80 manual front cut will be around $6-7k, the cost from there varies depending on how much of the work you're doing yourself and what else needs to be done at the same time.
How hard? Pretty hard, but not as hard as a lot of other conversions. I wouldn't attempt this as your first serious project, a certain amount of knowledge and experience would be required to pull it off satisfactorily.
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