If you want a newly bult 356 replica with a Subaru motor, your best option is either an IM or a Beck. Personnaly, if I was in teh market to have a new replica built to my specs with a suby motor, I would contract with Specialy Edition (Beck) to build you one.
If you are OK with one already built, you may be able to talk me out of my SAS Cabriolet. I only drove it 4-5 times thhis past summer... maybe it's time o let her go to someone who may use it more than I have.