Leak: fuel pooling on the intake manifold

Take a look at the picture. After a good day of driving today I found fuel where the arrows are pointing (I had wiped most of it away before taking the picture). While idling I could also see some, what I believe is fuel, bubbling/sizzling between the intake and head (closest to the area of the top arrow). Passenger side was the same, also pooling and sizzling. I have before this also noticed a hissing sound that I cant recall hearing before. Mostly while cruising. It's not very loud, but it's there. The carb is as good as new, bough it recently new.

The hissing sound would suggest a vacuum leak. I have gone over the carb and plugged everything. It was still there.

The intake manifold was removed last sumer when I swapped cam. I have gone over it and torqued it to the right specs. What may cause the pooling? Bad intake gaskets? Blown head gasket? Cracked intake or head? Need your knowledge!

This is the combo:
1970 duster
1965 - 273 commando
Cam: Comp Cams Magnum 282S - 282/282 Lift 495/495 (solid) Beehive Springs
Edelbrock D4B intake / Holley 670 Street Avenger
Pertronix Ignitor II & Flame Thrower coil
Hooker Headers
2.5" Dual Exhaust / Super 44 Flowmaster
8 3/4 - 3.55 - SureGrip
727 auto / Shift Kit
10" 2000 stall converter
B&M Quicksilver Shifter