Here is the head flow data on all Edelbrock Heads. It is also on the Edelbrock site if you don't have a pdf reader.
http://www.racesearch.com/PDFCATALOGS/1602/118.pdf
It's generally easier to find the small block flow data. Here are some bb flow pages but the info looks slim
http://users.erols.com/srweiss/tablehdc.htm#Ford
Do you have more specs on your cam? I would like to try running the numbers as well but don't know much about that cam.
If you want more HP and TQ, focus all your attention on "heads and cam". Since you are still planning the engine, you can easily get way over 500 with the right edelbrock head and a good crane or comp cam. If you try to stick to authenticity, you will have to live with 350ish. You might be able to get a port job and mill compression to 10:5:1, but that's about it.
hope this info helps
Andy