A Holley red pump is a good start, buy another one and plumb it in parallel. Sound like overkill?, let me tell you why. You are going to be feeding an oxygen rich gas at high RPM, to use this oxygen you need fuel to compensate or it will go lean. You ever hear detonation at 5000 rpm? Of course not, at that rpm there is so much noise and things going on you will not hear it. If you run into detonation at this rpm with N2O flowing the engine will go lean and combustion chamber temps go through the roof. It always seems that they run just great until the hole appears in the piston. So this means you do not want the fuel pressure to drop at any time, high G loadings at launch can play havoc with fuel pickup so keep that in mind too.
Fuel pressure requirements have not changed but your volume sure has, thats why the dual pumps and big lines. Listen if all you want is an extra 50-75 HP you might get away with your stock setup-MAYBE! The problem with N2O is it is so easy to dial it up and get more more MORE! This is what gets most people into trouble. If you can restrain yourself and have a well dialed in fuel system then go for it. BUT your stock lines are not sufficient for anything but the stock carb. I recommend you upgrade the fuel system, the gauges, etc. if you want to be playing it safe with the minimum shot. It is not worth a blown engine to find out the hard way.
How much will it cost?, the sky is the limit. If the N2O system is $400 then add another $600 for the modifications to use it safely. If you do it right the first time then you can play with more N2O. Otherwise you will be stuck with a marginal system that can be brought down by something as simple as vapor lock. It really depends on how much, how fast, and how well built the engine is to take the added pressure. Don't be discouraged, just don't do it cheap-you will be sorry.
BTW rpm is irrelevent, high combustion pressure and temps are what causes the damage with N2O. Ignition and timing becomes all important with N2O so throw in a heavy duty ignition system to light it off when it needs it. That HEI won't cut it for long.
Message edited to be chemically correct
[ March 22, 2002: Message edited by: 4 Jaw Chuck ]</p>