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V12 is a foot longer will it fit http://v12ls.com
Flat plane is good in a Miata just enough TQ to get it going and rev till kingdom come
Also check http://engineswapdepot
Bigger question, what is the power/output per litter on the motor N/A?
The F140 FE V12 N/A is producing 800hp, and no reason to go to a V12 when it not making as much per litter as say a built LSX502 at over 800hp N/A (which is a is a drop in motor for the vet isntead).