[Marine-58]

Wrenchbender makes a good point. I was reading the original post about a Lunati bare bones cam, thinking it was close to a stock grind. If it is more radical, it can certainly mess with idle. All adjustments become more critical and less forgiving and you do lose vacuum at idle.

You don't mention changing lifters. So I have to ask if the lifter (new or old) were properly adjusted after installing the cam and also if you followed the directions on breaking the in cam.

Aside from this, I just noticed that you set the carb by turning the air adjust screws all the way in and then backing them out two turns. Not knowing what carb you have, you may want to adjust them a little better. I would start with 1 1/2 turn out for each. Disconnect the distributor vacuum and hook up a vacuum gauge. You want to adjust them one at a time for the highest vacuum reading. It takes going back and forth a few times but it can help. IF you are turning the screws in and do not find where the idle drops off or the engine stalls, good chance when you over tightened them, you may have turned them a little hard. It doesn't take much pressure to blunt the ends. At that point you lose you idle air adjustment. Replace them if that is the case. Otherwise, you will never get that setting correct.

As you make adjustments, turn the idle down a little. Keep going back and forth while lowering idle. If it is the carb adjustment, you will get there in a few minutes. After making a couple adjustments, it helps to rev the engine a couple quick times just to make sure it isn't loading up. Be sure to do this with the engine fully warmed up.

Guessing that the cam is not extremely radical, the torque converter is a long shot. I would try everything else before that.