Parker do sell a funnel web to suit the CHI's from memory. Have you contacted Parker about it? As they'd be the best people to ask.
My CHI's were just thrown on when I 1st got them. They've been milled a tad now to raise the compression. Your combo should do more than mine with the larger camshaft. I plan to see how well the CHI manifold works shortly. I am dropping my car off to my dyno tuners workshop for some custom work in 9 days. Hopefully what needs doing doesn't take long. I'm expecting a 300rwkw run pipes on (2 1/2" twin system with triple flow mufflers). Then I'll run it up again with no exhaust to see how much the system is really killing it.
Which CHI's? I personally like the 218's but also due to them not being restictive when it comes to a stroker combo down the track.
Is there any reason you wouldn't use the matched CHI manifold? Or are you going to use the Funnel web (low) manifold? Here's what the 3V manifold looks like on my engine.