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If it were me I'd try to find a usable 428 crank - in a budget, moderate power deal it really don't matter if the crank is 20-20, or 30-30... and they sell for less - much less. Stock rods with bolts and recon. Probe sells a pretty inexpensive .030 over "410" forged piston. You will need a balance job. Assuming you already need pistons and rod reconditioning, we just got 20+ extra cubes for somewhere well under a grand.
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Isn't a balanced 4.25" stroke Scat with new crank, rods, pistons,rings, bearings under $2k? Diamond offers 4.10 pistons with the 1.330 compression height for the 6.7 BBC rod. Both 6cc and the 17cc probably needed here. Wouldn't that make a 449 for $2k plus boring, honing, and align honing the mains?
I would probably spend the extra $500 and use hydraulic rollers. I believe they have better lobe choices. In any event, with the big cubes this would make your performance targets with fewer revs and longer resulting life.
Barry could probably sell you the balanced rotating assembly.
The heads are trickier. Fully CNC's are out side of your budget ($3k). So either stock, or with a once over and some bowl work...which would probably be a stage 1 or 2. Keith Craft or Barry could probably help here, as could some better local shops. Even stock, the heads would probably be ok.
I would spend the few hundred more for a carb from one of the better carb builders, one (I think Pro-Systems) used to advertise here.