I'm thinking about putting a 390 in my 67. I figured I'd do a mild build since it's a street car. So what's best bang for my buck. Is there an OD standard i can put behind it? And what kind of rear gear ratio should i go with? Would like a locker as well. so what do you guys think and thanks for the help. Forgot to add that i plan on boring it .30 over, running shorty headers.