Slp Package
The 5.3 truck heads, 6.0 heads and LS6 heads are worth reading up on.
I would look at a few other packages too.
TEA did a package for verbs that pulled 437 at the rear wheels. Much better than SLP's 445 at the flywheel. Cost less than SLP's and have dual springs!
GTP heads w/Thunder Racing cams also pull excellent 430-440rwhp numbers. Cost a little more but GTP is known as one of the very top head porters...maybe the best.
MTI heads and cam. While pricey MTI products are very consistant and appear trouble free compared some unnamed vendors. 430-440ish rwhp pretty common with MTI set up's and all the bolt on's and tuning.
I'd read up as much as you can there are just a starting point.
Also JPR has some H&C set ups that do very well and are very streetable.
Good Luck






