[Buzz]

One other point about accuracy to the originals is in the chassis details. ERA builds both (big and small block) models on a rectangular tube chassis with a coilover suspension. For their MK ll, SPF uses an authentic round tube chassis with the correct transverse leaf suspension. The body shape is beautifully executed and if superficial appearance is a primary driving factor, it certainly holds its own against the ERA. I suppose it would boil down to whether folks feel the authenticity factor is worth the relatively reasonable bump in the sticker price for the SPF.
In your particular circumstance, I would imagine that after getting an ERA through all of the regulatory hoops with the additional expense of a right hand drive conversion on top of that; you'd come out way ahead going with the already available Superformance offering.