Believe it's still the case - the chassis is pretty much unchanged.
The issue is, I think, clearance to the front bulkhead, and how low you can mount the engine, (primarily sump clearance). Having said that, it's obviously not really a problem, but certainly something that would hinder the fitting of a longer engine as the angles would only get worse.
BMW V12 is also a good option - almost exactly the same length as a SBC
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