If it’s the Oscar dude, you’re better off getting an Lq4 out of the junk yard, tearing it down and rebuilding it. 2300 is a lot IMO for a 5.3. You can find Lq4's for 1/2 that. Make more power, and torque. As well as respond better to mods. Hell, get an Lq4 bare block, bore it .030 over, get 4.0 crankshaft, and nice pistons and rods, you got yourself a forged 408. I bet you can get the rotating assembly for about that.