What engine are you using? If it's an early SBC what about using a mid 80s TPI manifold and injectors, should be ablo to get the entire setup including injectors, fuel regulators, sensors, throttle body, etc for less than $100. Then just add your controller and harness.

If you need something more aggressive you can buy pre-machined injector seats which can be epoxied or welded into place on your tunnel ram or single plane manifold. I seem to remember you can buy a seat cutter from Russ Collins Ent (Torrance CA?). Fuel rail stock can be bought in 18" lengths from several suppliers. Check on http://www.msefi.com for sources.

Regards, Mark