Not worth it to adapt a system. It used to be back when turn-key aftermarket solutions weren't available. I did the research (and others have) to adapt a 454 TBI system on to a 440. And GM 3800 port injection to a 225 slant. It made sense 15 years ago, but now you can get an aftermarket setup with full technical support for so cheap these days that it is not in any way feasible to try and adapt an old system.
The Holley 2300 EFI system is $850 for the base kit and FiTech has a similar offering for $795. If you have a stocker slant 6, one of those is your best bet.
