Intake manifold recommendations?

[Project1970]

OK, now that I've got this thing called "money" (graduation is great!! haha) I want a new intake manifold for my truck. It's a fairly stock 350 with an HEI, a mild cam, a 750cfm Quadrajet, a cheap dual exhaust with stock ram's horns, and it's in my shortbed 2WD with a 3.73 rear. It's got a TH400 in it but I'm putting a 700R4 into it ASAP (which is SOON)

Anyway...I can hardly get the thing to rev beyond 5000RPM, so I'm looking at the cheaper, entry-level dual-plane spreadbore manifolds that advertise power in the idle-6000RPM range or thereabouts.

Is the Edelbrock Performer the way to go? Or is there another manifold that works better?

(I would love someone forever if they'd run this through Desktop Dyno.

And also...as a side note...how do these manifolds compare to the stock one in height? I think I'm pretty low on clearance with that 5" tall air filter, heh...so I might have to go find a 4" or 3" tall K&N instead...