Stroker Build with Six Pack

I want to install a new motor in my Dart sometime soonish, and thought a mean R3 racing block small block stroker would be fun. (I've been reading How to Build Big Inch Mopar Small blocks)

Most stroker builds recommend performance heads W2/W9 which aren't compatible with the standard bolt pattern of the Six Pack manifold.

Could anybody point me to solid stroker builds that use production bolt Magnum heads, or advise feasability of machining the Six Pack manifold to work with racing heads?

The idea is that the car would be a v fast street sleeper.

Thanks and regards all