Pistons + Rings - Arias or Cp or Tomei, up to $1500
Rods - around $1000
Crank - Around $1000
Total = 3.5k
If you go rb30 bottum end add the cost of the block and pulleys n adaptor plates i think (unsure, there is a topic somewhere) couldnt equal more than $1400 so youd probably just get it done for under 5k for rb30 complete bottum end
Prices on HKS 2.8 litre kits start from 5k for 600ps
21004-AN002AU $ 5,313.67AU HKS RB26DETT 2.8L STEP 1 441kW(600ps)
21004-AN004AU $ 6,955.01AU HKS RB26DETT 2.8L STEP 2 588kW(800ps)
2104-RN006AU $ 8,696.49AU HKS RB26DETT 2.8L STEP 3 882kW(1200ps)