[Gaz64]

Rune,

The only advantage the plenum manifold will have is you have no linkage balance issues to contend with.

Of course you'd be used to carb balancing, so should be a walk in the park.

With an IR manifold, you would set the throttle blades all at 1/8 turn open, and with interconnecting plumbing for idle air control the cylinders should balance out.

With a plenum manifold, you're limited for injector placement, where as an IR manifold you can have the injectors anywhere, right back above the trumpets makes most power.

If cost is not really an issue, I'd go for a crossram IR manifold, 50-55mm throttle bodies, with the injectors outboard of the trumpets within their own airbox per bank.