These have been very good for years: https://firewall.ca/index.php/camdrive-500-psru/ The DOHC V6s are going to be close in weight to an LS3. Might as well de-rate the rpm and make the V8 last a long time. With a turbo and low boost, 3500-4000 rpm will make the requisite power. And yup, should have had a Conti 550 or Lyc. 540 turbo to start, expensive as they might be. The test program won't get far with this abomination in the back. They haven't even begun to start finding the major problems with this design.