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Originally Posted by mazspeed
Is there a better carb hat?
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You bet, but they're probably taller and may give you hood clearance issues.
Good hats:
CSU
Extreme Velocity
SDCE
I am partial to the SDCE hat (and not just because a friend designed it, he forwarded me a lot of test info and that's why I'm partial to it) and it is probably the lowest-profile option of the three. Honestly all 3 are good choices and far better than any of the ATI hats.
You can see the EV and SDCE hats here:
http://www.superiorairflow.com/extreme_velocity.htm
As far as your car dying when coasting down from higher RPM, Jody hit the nail on the head. If you have the FPR reference hooked up below the carb, at high RPM overrun there will still be air stacked up in the hat & float bowls and insufficient fuel pressure to keep the bowls filled since the FPR is referencing off manifold vacuum at that time (lowering fuel pressure) when in fact it needs to increase fuel pressure to offset the pressure that's still in the hat. With the reference line in the hat your fuel pressure will always be at your base pressure setting + whatever pressure is in the hat, keeping the fuel pressure balanced against hat pressure.