360 Magnum vs 340 mild street build - my experience

I’ve got the spacer. And I think I’ve read that yes, I’ll have to get a different sized Torque converter. He’s trying to talk me into putting in a manual transmission and bigger rear end since we will be taking it apart anyways lol which I’m leaning towards that
You will not believe how much a "3500 loose" 10.5 converter will wake your car up. Do that first and You may not want to touch anything else. When ever we install a high stall converter in a customers car. The response is "Wow!" or "holy ****!" or "I Can't believe the difference!"