"interested in throttle bodies? i think I can get you quad TBs on a manifold for about $250, then just ad fuel only computer, cheap injectors and off you go..."

As already stated...doing this will cause headaches with the vacum advance due to low vacum.
Best bet would be to get a 3D computer...This would allow you to use Throttle position to determine ignition advance rather than relying on a dodgy vacum signal.