If you get rid of the long runner intake, your car is not going to idle as well, or be as streetable. Stopsign32v just mentioned in his thread that he removed the box style intake because it wasn't streetable. Something to be considered given you seem to be real concerned with street manners.
actually motors as a whole are very similar. short runner intakes will perform better in higher RPMs and not as well at low RPMs(street driving) whereas long runner intakes have great low end torque but suffer some with high end HP(in other words great street manners)
if you want a racecar short runner intakes are great if the motor is designed for high revving power. if you want a great street car i would go long runner because you wont be using really high RPMs for normal street driving
Regardless of displacement, a short runner intake is going to give you poorer idle quality and driveabilty. BlackVert seems to be more concerned with driveabilty than peak power. 410cid vs 331 cid has nothing to do with it. LXx engines have longer runners than they appear to; at least 10" from the common chamber to the valve. The runner runs over the top to the other side of the common chamber. 4.6 engines have retarded long runners.
410 vs. 331 has nothing to do with your low end power?
I personally think long runner intakes are the worst thing to happen to mustangs.
That's just my opinion though do what you want.
see, this is what i hate about ebay ...
it was listed for $50 with a buy it now of $100
so i bid on it (max bid of $120) and it sat there for like 3 days with only my 1 bid on it. then at the last second i was outbid.
i guess i should have just done the buy it now and been done with it