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I just picked up a perfect Performer RPM manifold for $40. I was thinking about throwing it on my 360 in my 78 Fury. Its a stock E58, with the exception of an Edelbrock 1406 carb, XE256 cam, Hooker comp headers, and dual 2 1/2" exhaust. Im running a stock converter (for now) and 3.21 gears. The RPM is "advertised" as being effective from 1500-6500rpm. Im unfortunately running a regular Performer on it at the moment. Would the RPM be any kind of a gain over what I have? It may be a dumb question, but most of my experience comes from real performance builds, with much higher power levels, in much lighter cars. I figured for $40...it may be worth a shot. I just dont want to lost any low end torque...gotta get this barge moving! 
http://compcams.com/Community/Articles/Details.asp?ID=-738676943
look at this, stock blueprinted 340 that Dulcich did a series of bolt-ons. step 3 is a stock 340 with an 800cfm eddie and headers (that has a cam similar in duration to the XE256). step 4 swaps the stock intake for an eddie RPM air gap (runners are basically the same between the RPM and Air Gap)...25HP increase at 5100 RPM and 25lb-ft at a similar RPM, and even 12-13 lb-ft at 3300...
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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