Somebody posted the correct gasket to be used with an aluminum intake back above but tell me one thing,how much pressure did you pump up to get that many leaks?I had a 63 Ford with the 221 engine that had an intake leak so small like yours that I drove it for 5 years and only added anti-freeze once.But my leak wasn't aluminum to cast iron either.20 pounds should be enough pressure to test for leaks.
It is the Felpro 1250 S-3 that is recommended. The general consensus is that the regular Felpro 1250 would blow out after a year or so.
I used 10 pounds to test the radiator - I could probably go higher but I was seeing enough leaking/dripping with that pressure that I was satisfied.
To put my mind at ease, I am just going to replace the intake gasket and know that I should be good for a few years.