Fueling & Injection - injector size ?'s

I am building a 422 cuin steel block engine it should be near 500 rwhp all the injector calculators say a 42 lb injector should be fine. I see people with the same hp with 36 lb injectors. I have a set of 42lb svo injectors is this a good starting point or are they too big or too small?

They are rated 42lb at 43psi right?

I had a 422ci and ran injectors that were 39.5 @ 58 psi and I made 475rwhp and had room up to 525rwhp supposedly.

yes they are 42lbs at 43psi.

So 42 @ 43 works out to being __? at 58?

MTI uses 36 lb SVO's.

I would say the 42's would flow 56 lbs/hr @ 58 psi of fuel pressure.

John roughly a 48# it equates to