I'm not in the business of conversion.
I'd think Hilborn would convert an Algon manifold, or offer to sell you an FE Hilborn manifold already converted, probably for less money.
As mentioned above, Kinsler might be another place to look, or Wilson manifolds.
What you want is someone with the bit that will mill the injector hole properly...it has a seat, and you want a tight fit. The rest is, as you say, machinist 101.
The hilborn pumps etc are only of interest if you want to get the mechanical injection system working. For an efi system, they aren't needed and can't be used.
As for the efi system, I don't want to give an opinion. It's all about what you want your level of involvement to be, and what you think your programming skill level is. The most important thing to consider in choosing an aftermarket efi system is the level of support that is available to you locally and if not locally, at least the capability of web-support, maybe even being able to hook up your engine and getting it tuned remotely.
I've seen individual feeds to injectors. It gets pricey, and I'm not sure that the tubing used on old mechanical injection systems are up to the pressures needed. If you get creative, you might convert the distribution block and the tubes, to a vacuum bank for your MAP sensor. Don't forget you'll need a TPS sensor mounted on the linkage somewhere.
You probably won't be able to use an IAC, so you'll need to provide idle air by adjusting the throttle blades.
Again, and finally, it's really about how involved you want to be in your project.
Here's the Hilborn version of what you probably want:
http://www.hilborninjection.com/prod...=368&CatId=176