Welcome to CHR!

Sounds like you’ve got a good build going. I don’t think your 700 is large enough.

If it were mine – I’d put a stage 3 Quadrajet:
https://www.summitracing.com/parts/jet-36003

This carburetor would require an adaptor to run on the Weiand Stealth (which I like too) i.e., an Edelbrock 2693 which would raise you up another ¾ inch.
https://www.summitracing.com/parts/edl-2693

If you stay with a square bore, the Holley Street Avenger gets good marks:
https://www.summitracing.com/parts/hly-0-80870

Others will chime in I’m sure.
Glenn