+1 for the LS all-aluminum fuel-injected GM small block.
Why you'd want a carburated iron-block V8 in that car is a mystery.
The LS motors add about 50 pounds to the nose of the Miata, compared to stock NA, and not too different than the factory turbo Mazdaspeed
You also wouldn't need the fugly hood. The LS tucks under the factory hood just fine, with room for a brace.
Visit LS1Tech.com and look at their 'swaps' subforum. Lots of Miatas there getting 500hp
