You might want to test your flow with it first (just hook up your pump and see what kind of flow you get).
If it's a real problem, you could reduce resistance by half by converting to two serpentine loops - requires two tubing cuts and a pair of 'Y' adapters - not nearly as difficult as a full manifold with much of the benefit.
If you've got a radiator shop in the area, bring it over there and talk with the guys in the shop about it. Remember that you have something that might be quite interesting to folks bored to tears with automotive radiators. My experience is that they're even more interested in things going into competition vehicles - but that anything unusual is better than their day-to-day drudge...
I've also found that bringing along a six pack as a thank-you when you pick up whatever they've done gets you much faster attention the next time you need something done, but I think that's true in all sorts of machine/welding/engine shops...
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