Never have looked into them, man they are at a nice price though lol compared to other BB heads anyway. You may wanna look into some reviews on them before thinking too much into them, just to see if anyone else has tried them out. Are you looking at them as just a lowish cost upgrade if your heads are bad? A used set of stockers can't be too expensive. There would probably be some performance gain to be had with aftermarket heads, but I have a gut feeling that the intake is going to become a limit.
It sounds like there is some room to improve your tune for sure. Engine temp on the gauge isn't computer controlled th
Pretty sure efi live will do what you need, there are a couple people on here that use it. I believe hp tuners is going to offer an upgrade for just the price difference once they release pro, but I'm not 100% sure on that. For gas engine tuning a wideband is a must IMO. At least you could get quite a bit of the issues fixed with the standard, and tune the vast majority of the airflow tables with the narrowbands until they release pro.
Not surprising to hear that about a shop too, they're spendy.