Sounds like a healthy motor if it's pumping that much compression w/ the 509 cam. Ought to run strong! That 509 cam makes real good power...I ran one for years.
The Edelbrock RPM intake is a VERY good choice. If you happen to run into hood clearance issues w/ it (it is kinda tall), get a Holley Street Dominator manifold. It's a short single plane and runs almost identical to the Edelbrock RPM. Even though it's a single plane, it still makes a LOT of lowend grunt.
I've seen some cars w/ Edelbrock RPM manifolds under the factory hood and some that wouldn't clear. Just throwing that out there.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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