Ok, so its a miata, good stuff.
EFI 5.0's are all over the place; I'm going to echo Brock's suggestion with Rocket... Rodney is bound to have atleast 1 laying around.

 

I'd also talk to a forum user by the name of FlimFlam. I believe he owned a 5.0 liter Ford powered Miata. I'm sure he could give you some installation or general advice.

 

He bought it swapped.
I do know that the MonsterMiata kit was used (www.monstermiata.com). The fit and finish kit was almost as if factory.

 

Well, I'm having a buddies shop do the install, gonna get the quote in maybe three days. But yeah, I figure if I get it stock at that 225-250 hp it'd be better for me to learn how to drive the thing. Also give me some time to start saveing for some rims. Looken at the FNR's from 5zigen, might get 16" 33ish in the front then the 17" 44's in the rear. The kit is supposed to come with wheel spacers, however I still gotta check out the clearance. There's one thing for sure, those tiny 15's on there=no traction.

 

Get a '87-'92 out of a Mustang.

 

You have no balls.

Get a 347

 

I think a 5.0 in a Miata is rather ballsy. Not to mention, a 5.0 has enough potential to make a Miata wicked fast.

 

Kevin's was a stroker, IIRC.

 

Ya' know? I think you're right. Regardless, even a basic 5.0 has enough potential to be scary in a Miata.