When you use a custom head with a proprietary intake flange Kevin, you basically have four options;
- Use the builder's proprietary manifold if there is one,
- Fabricate a suitable alternative,
- Use adapters to adapt an existing manifold,
- Use a different set of heads
Sometimes the exotic part we would like to use is not widely used for a reason. Even when we can find a way to make it work the cost is frequently more than a reasonably good alternative. For example look at the difference in cost between a 427 SOHC and a medium riser 427. The SOHC is a to die for engine but it comes with a you're going to die price tag.
These cars are too small and light to put really gigantic hp into. You might enjoy the car every bit as much, possibly more, one notch down the exotica ladder.