The LS idea is a good one - cathedral ports flow like mad. Here's a write up on a Ford I6 with a hybrid LS head -
EngineSwapDepot.
But you're into an experiment here - read $$. Should you find someone willing to undertake the prototyping - you'll have to bank roll the parts and the labor. And there is no telling how many times you'll have to try before you get a working engine:
2 or 3 blocks? You'll be experimenting on head-bolt boss relocation. You could hit water - you could have cracking when you try to torque . . .
2, 4, 6 heads? You'll be experimenting on where to cut - how to join the halves etc.
It's a cool idea for a project but it can't be approached as if one is just hiring a machinist to do known flat rate work.
