Indirectly, my old Cobra had the 3.5 RV8 and RPi sourced add ons (ie manifold), worked very well though it wasn't me that built it. They're very well known in the kit car world and their recon and turnkey engines are supposed to be among the best
I understand that the guy that owns it has got more rabbit than watership down and will try and sell you other stuff that you don't really need. I have personal experience of Rob Robertson [mamber]V8 Racing[/member] and would unreservedly recommend him, top guy.