Damn good info

To the OP P V, What is the main use you are wanting this engine for? You really never stated the intended use.

1. Is it just a Daily Driver that will put a smile on your face when your right ankle flexes a little?

2. Is it a street car Monday thru Friday and a Strip terror on the week ends?

3. A Trailer Queen that is towed to the track, run hard and towed back to the barn. This seems to be what most think you are wanting with 0.530" Lift cams and such.

So if just #1 above, a dropped in 5.9 Mag will do this so easy. Dead stock these 5.9's dyno out around 299 HP at a nice low RPM and peak out early at 4500 RPM, just what a DD needs. Yes replace the oil pump and springs. RockAuto has all this in stock. Spend the extra $6 each to replace the stock roller lifters as they get tired too. If you have time, drimmel out the 'Boogers' inside the ports on the heads, you will find lots of crap hanging in these.