Getting started on a 470 stroker, what carb ?

If you had the cash for the carb Rusty posted I’d Beal, for that.

Aside from that, what you have is fine. I’d pin gauge every hole in that thing and write down every hole size.

I’d start with making sure you have only 2 emulsion holes ~.028-.029 and blank off everything else. Depending on what metering blocks that has, it may have 3 or 4 emulsion holes. If 3, block the middle off with a 6/32 brass set screw. You’ll probably need to to for that. If it has 4 you block 2 and 4 from the top.

Next up is to add transition slot restictors. I use a brass 8/32 set screw for that and start with about an .080 hole.

If you don’t have the tools to do it, you can buy them cheap or pay someone to do it.
Yeah when I run numbers on calculators I come up with my carb up to 925 cfm.
I am going to put a 850 base plate on, I think there's a little massaging. Thank you for your reply