New Motor Oil Leak. HELP!

OK i recently installed a new motor in my '89 Mustang GT w/ a tremec t-5. The motor started and everything ran fine but after it ran for about 15 minutes a noticed a oil leak starting.(lost about a 1/4 of a quart in 20 mins) My first reaction was rear main but i took extra care putting it in so i didn't see how that was possible. Also the oil is leaking from the passenger side of the motor(not straight down like a typical main leak) and its dripping off the starter. What could this be? Any help would be great cause i have a built 306 that runs but i cant drive it :(
 
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no all i can see is that its running over the starter. and its not the valve cover i checked that. a local mustang performance shop told me that it had to be a lower intake gasket to be coming out of the motor that high up. But i cant see any leak from there