I would also say spec c or a v9 same setup as v9 spec c minus the oil cooler out put and the vf36 but same cams.
and to make your life super easy hit up Ia performance on there avcs kit for easy install.
He is a stand up guy!
But all in all they will both require almost the same amount of work. And make sure you get a non immobilized ecu. the V9s come with them and some late version 8 or ask the company you are getting the engine for to make sure you get a 581 ecu from a v7.