I have a stock 68' 340 motor on my 1971 duster. It was basically handed down to me by my brother. He had some mopar purple cam and single plane intake before. I wanted good street manners along with power from idle to 5500rpm. I've since installed a dual plane edelbrock intake manifold 620cfm holley carb and 2500 converter. The rear gears are 3:55 and the transmission is a stock 71' 727 torqueflight. I wouldnt mind changing to a different converter. Can anyone recommend an excellent cam and converter based on my intake and car and rear gear ratio? I don't know the specs on the cam and my brother forgot. Thanks!