Notice there are a number of differences between the rendition and the picture. I cannot be positive but I am guessing the picture is the actual production version.
Differences: said alternator, turbo orientation, intercooler design and more.
Regarding the throttle bodies... remember, you do not need much or really ANY more TB flow than the tubes that feed the TB. If you have 60mm tubes then a 65mm TB should be plenty (accounting for the loss of the plate and shaft).
NOTICE also that this is a cam in block design... a bloody pushrod engine!!!
Has to be junk... right?

onder: