318 Motor, please help

manifold vaccum at idle in park...I am still thinking 10 is low.
keep in mind now that i found the vacuum leak, nothing is in tune anymore and i wont have time until the weekend, but i just hooked up the vacuum gauge quickly. at idle it's reading 16, then when i put it in drive it drops to 11....definately needs some tuning and timing BUT the good news is the RPMs barely dropped this time when i put the car in drive. i dont have a tach yet but it was very noticable how smooth it tansitioned this time verses before. once i get it all tuned back up this weekend i will know what power valve to put into it.