how to build a 6.0L
However, if you must...
I think your best bet would be to get a low mile shortblock to build, or rebuild a cheap shortblock. You could run some Patriot 6.0l heads, they are a little over $1k with dual springs. Look around the for sale section and try and catch a Trex, MS3, or other 235+ sized cam. You could run an LS6 intake (I think) or you could spend about the same and run a single plane Vic Jr. That's budget and should hit 450hp no problem.
If I were to do it, I'd have to go all out. Rebuild shortblock, try my best to talk myself out of stroking it to 408, forged Diamond pistons, Callies connecting rods, ARP everything, new fuel system, ETP heads, 90/90 or single plane intake, boost cam, and, oh why not, a D1SC. That could get you around 2x your goals.



