I spoke to several converter guys about this. I have a couple of 12" converters here for cores. Apparently, there are no internals available for them for this kind of build.

And they said the 11" are hard to find and expensive because some of the racers scoop them up when they come up. So we're basically stuck using the too small 10" stuff because there are cores and internals readily available for them.

I am just reciting what the converter builders have told me.

As to the intake, I have a Street Dominator. Good intake. But I converted it to Dominator flange years ago and it looks like it would be a chore to shrink back down to 4150.

So it looks like the RPM is the first choice for many here. Followed by the Indy dual plane and then the Holley.

Probably all good intakes that will do the job AND fit under the hood with a 4150 and maybe a drop base air cleaner.