351w na build combo opinions

I'm not a carb guy, and I would always go with a custom cam, but the heads, displacement, and lift can get you there. The question is whether or not you're going to run out of RPM on that cam or on the limitations of the rotating assembly first. Sorry that I can't give a good recommendation on a carb, but those are the right heads, IMO. It should rip. I'm assuming a manual trans, but if it's auto, it can look like less power on the dyno than it will run like at the track.

With those heads on pump gas you will want to set timing around 28-29* at wot. Trust me when I say you will see a drop off in power above that point, the 11r head is not like most sbf heads and excessive timing will hold you back. Even lower comp wont like much over 29*
Each engine is different but this has been my finding from a few builds.

Hey man!
I believe that combo will exceed your 450hp mark by a huge margin; In fact I think 540+ is not out of the realm of possibility...those heads just flat rock n' roll. That being said, I would fear that it may happen at a far more lofty rpm than a stock bottom end is gonna like continuously. Just bench racing here based on past builds of course, but I'd be willing to bet that combo won't start making good power until 3k or later with less than 360 cubes pumping air, and is going to want to pull to the moon...or I mean at least until the limits of hydraulic lifter control. Furthermore, with that hairy of a cam, a guy really needs at least another full point of static comp to keep your cylinder pressure in the sweet zone. That is if I'm looking at the right grind of course. In short, it looks like this is one of those builds that could be optimized either way with just a couple of parts changed. Like either go with a nice light aftermarket crank and rods, bump the comp up a bit, and go ahead and twist it to seven+ and make 600+hp, OR... back off a whole bunch on cam, dual plane it, and enjoy a big gob of upper mid-range and throw in the towel at about six so she'll live forever. Also, I HATE to even go here, because it's such a typical response from the whole "dude, go bigger everything" camp, but there's no denying of course that 408+ cubes would gobble up all that air nicely and likely live a long and happy life twisting to 6500-ish, too...just something else to consider if you're not completely against the idea of a stroker motor, sir. One thing about it, you've got some major kick@$$ parts in the pile; those heads are awesome, AND you're gonna LOVE that Sniper set-up when it's all dialed in...the response on a good combo is insane, and it's really nice to be able to just bump the key and walk away, even on a pretty aggressively cammed motor. I know I wouldn't give mine up for nothin'! As stated before, please keep us posted; I'll be dying to know how that bad larry runs...you should be happy no matter what! Best of luck on a smooth build, and happy wrenching, bud!

13.3 is best lean power ..... Personally I would have enrichened It to 12.5