There's a whole other bunch of options, but look at it overall by virtue of metaphor.
Say you want to build a new timber fence beside your house because the old one's rotten.
One way is to say
OK, I'll take down the old fence. THEN discover you need materials. Wait while they're collated and delivered. THEN dig new post holes, set posts to a stringline, install the rails, finally nail the palings on and cap it.
Or - you can take measurements, calculate quantities, find out delivery times, place an order, and just as you've finished digging the new post holes, your materials arrive. Proceed as above.
The second option's a lot smoother, isn't it? Proactive rather than reactive.
My point by use of metaphor is no matter which way you go about it, you need to
manage air, fuel and spark. If you choose and develop systems to deal with these parts BEFORE lunging at forced induction, they will only require re-tuning at the stage where you install a blower. So, it makes the process somewhat simpler.
Plus, in the meantime these aspects will help you milk a N/A motor for every last ounce of power.
Modifying a head is not that hard but you really do need a blacksmith's shop or similar to do serious welding. Someone who understands metal differences and tempers. Don't expect them to design it; that's your job.
Cheers, Adam.