Vaccuum leak....need help!

I have a 65 coupe (see sig) which I recently put a 306 ci with all mods listed below. This car has no power steering, no power breaks and a T5 tranny (cable clutch). The car runs relatively well (although I haven't driven her hard during break in) and idles fine. When giving it gas the vaccuum goes up. I've checked the intake bolts and used plenty of sealant during assembly. Checked the carb as well by spraying some ether around it, giving it gas and noticing no "jump" in the throttle. Also replaced gaskets, etc. My AFR heads have several "holes" in the front and rear. I've plugged the four I was sure went though (for smog crap I assume?), but not sure what the others are used for. Anyone have AFR heads?

I'm learning as I go so any help would be appreciated!!

doh!

Damn! Almost blew my car up!! jk That's a good idea, actually. Better then dickin around with ether......any thoughts on where to check for leaks??

Yeah, I connected a vaccuum gauge to the port on the intake where my automatic tranny used to be connected to.