Have you ever wondered what a "normal" street 390 would do if you added the traditional modifications? We just buttoned one up that answers the question pretty nicely.
Its a basic .030 over 390 with Speed-Pro flat tops, Edelbrock heads with no modifications, a Performer RPM intake, a 270H Comp hydraulic cam (224@.050, .519 lift on both sides), and a Holley O-3310 vacuum secondary 750 carb. Stock replacement oil pan, non-file-fit rings, Duraspark distributor. Nothing wild, nothing trick - just a good clean bolt together balanced assembly with good machining. Marc did port match the intake... You can definitely build this one in the garage.
Fired it up, broke in the cam, and ran it. No drama, no problems, oil filter was spotless clean. Had a nice idle at around 800ish with a bit of chop. This will make for a very, very nice street engine.
Power numbers were actually quite decent with a torque peak of 412 pounds at 3400. It's worth noting that the torque was over 405 at 2900 and stayed above 390 though 4900 - a very smooth and solid curve. Horsepower peaked at 4900 RPM with 364, but followed with a little return bump to 363.5 at 5500 before trending downward "for good". Numbers were reached with timing at 38 total, and jets in the Holley pulled down 3 steps to 69s in the primary. Air/Fuel ratios were surprisingly smooth considering the basic carb - trending between 12.6 and 13.2 - with a brief 13.4 bump just as the secondaries were about to/or started to open.
Pictures, charts, and the obligatory YouTube link follow:http://youtu.be/dXPaAkaPBAM