Mark at Phoenix had a conversation with me some years ago about how I should approach my build, He suggested you should firstly avoid opening the engine at all if all is well with a leakdown test and replace just the oil pump and water pump and service, however my engine had failed so the next best thing would be a new block from Toyota and then stock pistons with uprated rods as these are a known weak point, finally ARP bolts and new gaskets, no need for uprated bearings or pistons (my goal was around 600BHP)
It was once built an engine Mark was willing to guarantee to a modest power level