Trying to Gauge Interest In Some Parts

I'm working with a local machine shop on a couple of different projects, and the subject of Slants came up this morning. There are two items we are considering making prototypes of. One is an adapter to mount a Carter BBD on the standard one barrel intake (stock single barrel opening has more area than combined barrels of BBD, so there is no restriction), and the other is a set of billet aluminum main caps for all out applications.
Give me some feedback on this stuff...worth the effort? What's a good price? Etc.
We're also open to any suggestions you guys might have for other parts or adapters that might fill a void.