Hey Sandeep,
I would (and have) just get a Bosch 044 pump and be done with it. Less noise too, just ask Humble as he runs one too. It supports more than 500 hp
That pump also has a 12mm (1/2 inch) inlet size, so now you also know what the feed line internal diameter has to be.
High pressure line can be 8mm. What this means in AN size, I dunno, but you will probably figure it out
I would get a high pressure filter and mount it on the pressure side with 8mm fittings, like porsche does also.
Walter