Edelbrock heads (cam selection)

Call Comp; but I don't think so.
Street or Race?
I put a Hughes 230*cam in my SBM and they called for different springs, which I dutifully installed.
If your power peaks at 6000, and you have an automatic, then you will need to rev to over 7000 to powerband well. That means you will need a lot of oiling mods to help the engine survive.
And 10.4Scr will not be nearly enough compression.In a 360,With an ICL of 106, the ICA will be about 81* and the DCR will fall to under 7.1 with cylinder pressure near 137 psi. This will require a very big TC to get you off the line, and big gears to keep you on the pipe. Are you aware of these parameters?
This would not be a good street pkg so Ima hoping you are going racing.
10.4 is a very good number to run with a 270*cam. With an ICA of 59* the Dcr comes in at 8.64 with cylinder pressure of 175. This will work very well with aluminum heads, 3.55s and 2400 to 2800 TC, very streetable,tickling 400 hp.This is not like pkg6. The cam in pkg6 has some of the fastest ramps I have ever seen, and for sure the Edeldrock springs won't work.The powerpeak with the pkg6 cam, IMO,is still to high for street and an automatic.

In my opinion with a 727, and on the street, the powerpeak should not exceed about 5400.This cam will want to be out-shifted from first,at around 6800, to come in at 4000, and that centers the powerband around 5400 .Second is better, being shifted at 6400, to come in at 4400, for a powerband again centered at 5400.Thus the outgoing power will be near to the incoming power and so the most average power will be put down.Bear in mind that 6800 in first gear with 3.55s is over 60 mph, and 6400 at the top of second is 100mph;so you have a 2-gear Quartermiler with 3.55s. And the guy with the most average power, is most likely to win.This engine will still need the oil-system mods to survive 6800 rpm shifts. And the valve springs will have to go with the cam.