The damper doesn't necessarily need to be there, later models had it at the rail but earlier ones (possibly only those with external pump?) had it at the pump. If your pump doesn't introduce significant pulsing into the system you could easily get away with not having one at all.
As EunUCh suggested the regulator can go anywhere at the return end, maybe weld your fittings on and run a hard line to it mounted in some convenient spot (attached to the engine, don't run flexible line to the regulator).
What is their reasoning for the extra injectors, seems like another band-aid fix? My preference would be to run the standard rails with eight decent sized injectors, a standard regulator and a proper tune.
??? So to keep a constant pressure at the injectors does this mean that say at idle with a mani.vac. of 17hg (-6 psi) that with a positive
injector pressure that at that mani.vac. it would help pull fuel out of the injector at hi vac. resulting in an over rich mixture due to minimal injector pulse on time ?
I think you are understanding correctly, if I understand you. The regulator keeps the pressure difference between the two ends of the injector constant, even though manifold pressure varies.
This where the whole rising rate regulator confuses things, because it adds yet another variable by altering the pressure instead of keeping it constant.
I see, as long as it is after the last injector,but it wouldn't matter if it stuck out one side to avoid clearance issues?
Correct. Only other consideration is allowing enough fuel flow, note the regulator needs to flow highest at idle when the engine is consuming the least fuel.