I have the same reservations about using lift plates, but I've found that if they are used properly there shouldn't be any problem. The right way is to install all the nuts with washers and tighten them snuggly. When I say nuts, install them over studs, which is what should be used with a aluminum intakes anyway. Make sure there are plenty of threads.
Here we are lowering a Busch engine ($$$$) onto a dyno test stand using a cherry picker and lift plate. Granted, it's not as heavy as a cast-iron FE engine, but it's done with FE engines, too.
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