318 Build on a small budget
Google, 3-8 teen dream
It's a dead stock long block
With 4bbl headers and xe262h cam
Here's the dyno results
1st is stock 2bbl engine with headers
2nd 4bbl and cam
3rd is tuning
That's about as big a cam as you can go with stock CR. And head flow (cfm) starts become a restriction after that.
Upgrading to a magnum type head at that point would be a good idea.