Classic Roadster II also has a Coupe, check it out. The SPF Coupe is a modern design and deviates from original specs. Thats an important consideration for some of us, others could care less (maybe they prefer VW power as well).
The Classic Roadster Coupe is more true to original specs, all though not perfect.
And for those who say it's only a replica, fine, have you considered front wheel drive Honda power for your replica? Why not? It's modern, gets great mileage, easy to work on and 'ricer wing' friendly. After all, it's 'only' a replica...
http://www.classicroadsters.com/hdr_427_fia.html