Not all BBCs have this but because it has it does not mean you get "high performance" parts. Many of these have 2 bolt mains with cast cranks and truck heads or peanuts which make plenty of power to 4500 rpm but that's about it.

Unless you are racing the 2 bolt block is fine. Use ARP bolts on the rods and you are good to 6500 rpms. If you want to radius cut the crank fine and certainly check the crank, block and align bore it. Polish the crank at the least.

Check the rods and resize if necessary. Use the 3/8's bolts to 6500 rpm unless the motor will live there all the time. They are fine for street use.

Keep your flat pistons if they check out fine. You don't normally want more than 9.5 to 1 and you can't hardly go above this with stock pistons without at least angle cutting the heads or going to older closed chambered heads.

Stay with oval open heads. You will make more streetable power unless you are restoring something that calls for closed heads or you are racing. 049s and 781s are good but talk with your machinist or someone on here who does head work for a living. You don't need expensive heads again unless you are racing. You can get all the street power you want for $500 or less for your head work.

Keep your cam streetable. Talk with someone who knows your assembly and application or just talk with Summit yada and they can hook you up. They will want to know your entire powertrain including rear end, trans yada.

Keep your carb as small as possible but it needs to be able to deliver fuel up to your maximum cfms within reason. If you are going to drive at 4500-5500 at most 98% of the time or less stay with a smaller carb. You'll get more bottom end and spend less time at the pump. If you are going to live at 6500 rpm enough then go 750.

If you want faster I honestly believe you'd be better off with a real drag car. If you want bragging rights and can drive safe just build what you want.