Well the engine really needs to come in standard crate specification to allow Morgan to benefit from the emission approval. Doing anything else would limit the markets it could be sold in and be painfully expensive I would imagine. Not to mention the potential for increasing the service/stability issues.
The next gen engine in the BMW V8 line was intended to fit into the same mounts for M5 etc. within the same generation of 5's if I remember correctly. I don't think the turbos would fit around the chassis rails unless a manifold was created and this would destroy the crate engine emissions approval benefits. Mind you if the desire were there an AR Racing option around this could be considered (cannot find emoticon for psycho)
Or as often speculated here the twin turbo 6 would be equally cool sound motor if not quite the naughty yob the V8 is. The open exhaust on the Skyline GTR33V I had sounded stunning as it revved. It was not the open drainpipe models you hear today but quite deep and clean.