Pro-Flo EFI

[gagner]

Hey DIYers,

Just discovered the DIY-EFI a few days ago... this is a great forum.

I'm hoping that some of you can provide advice / opinions.

I recently purchased a '74 vette with a 383 stroker sporting an
Edelbrock
Pro-Flo EFI system. The Pro-Flo seems to be well engineered and of high
quality... however the low end torque is not what I'd like.

I have dyno data from Edelbrock comparing 350 and 383 engines with the
carburated Performer RPM package and the equivalent EFI package. In both
engine sizes the carburated setup has much better torque below 4500 RPM.

I believe this is due to the manifold design. The Perform RPM is a dula
plane
while the Pro-Flo uses a single plane.

I'd like to improve the low end torque and throttle response and would
not 
object to loosing some of that high end power.  Any suggestions?
Can the manifold be modified to perform more like a dual plane? Any
opinions
on the use of variable duration lifters?

Thanks.

Mark