Yes I have. I used to deal with those engines on a regular basis. I'd use a 427 block if it was filled at least to the bottom of the water pump holes, but that's it. The 366 is a boat anchor in my opinion..
I'm a big block guy myself, and run 565" + motors in my own cars. Bottom line, is if you're gonna spend the money, you're better off with an aftermarket block. There are quality 454 blocks out there that will take a .125" overbore, but I'd still fill the block at that point. The 427 and 366 truck motors were never intended as performance engines, they were built for heavy duty low rpm work. The heads sucked as well. The bores were non-siamesed, and that doesn't lend well to larger overbores. The 366 is actually a different block than the 427, in that the bores were cast smaller than the 427. It's factory bore was 3.935, and used the same 3.76" stroke crank that the 427 did. They both also used standard big block 6.135 con rods, but different pistons. The pistons were unique to those two engines.
Mark