I'd definately go with the indy 440-2d intake, 337 flows more on a BIG motor but you don't have enough head onthat combo to make it pay off, the 2D will keep up with 360+ cfm heads....plus the 337 ports are on the small side, need a good bit of work to go to MX and they're really too big to work on a 906 port unless it's opened up a pretty good bit.

I'd run a Bullet Hydraulic roller around 258/264 @ .050 on 108 in at 104, you could run a solid roller but the spring pressure you'd need to run it won't be worth the trade off unless you're spinning +6500, my (slightly bigger) bullet spins 6800 without problem and the MW self-ported 440-2d has no trouble keeping up with Chapman Stage VI's Maxies that outflow most BB wedge heads (other than a B-1) on both sides. Bullet sure makes some sweet HR stuff. I thought about a 337 (and I have one all set to go), but my 'little' 517 probably needs another 40 cubes or about a .720+ lift solid roller cam for it to pay off (ie, to gain more power than it gives up in torque/throttle response). Guy's have tested the 337 vs the 2d on some BIG (572") motors with Big heads and it's worth 40-50 over a 2d, but I doubt the spread would be anything close to that on MY 2d (and I offered it up several times)

When comaparing a single plane to a dual plane it's generally accepted that a Dual plane wants/needs a bit larger CFM carb to make a fair max HP comparison, you have to compensate for the fact that each intake runner is not exposed to all 4 barrels at WOT like it is when using a single plane.

IMO the ultimate street 500" intake would be a ported MW 2d with a 4500 flange The Pro-systems tweaked 1000HP responds like a GP sportbike on my motor:

http://www.youtube.com/watch?v=jd8GeXYYkKU