Need pro advice Project X Block build Long term project.

Hi guys come across a unused X block and some other parts here in Sweden, the only thing that has been done to it bored to std 340 and prepared for boost, the block has a O ring on top of the deck. 4 bolt mains ARP studs.

I have used good (truck) forged crank that i´m planning to use and new rods crs 6123 arp

This engine or project what you will call it, will be a insurance for my other 340 motor that are in my car today 69 GTS with mild 340 approx 400hp.

This spring the 8 3/4 gets a 4:10 and tf727 gets overhaul will be prepared for the new motor.
converter are stock around 2700 brakestall.

So now to fun part, what your opinion for real durable 450-500hp gladly streetable:lol:
i´m think approx 7000-8000 dollars total with machining and maybe build cost to give idea, have to consider the swedish crones.

any good suggestions, feel free :D

Best regards.
Rob