I know you have beefy new torsion bars but if your going to be racing the thing at all the 340 bars would be a big help for weight transfer. You have to remember your 512 probably weighs the same as a stock 360 or a few pounds more.
Im pretty sure that's not on your list of changing.
If you want a better converter, you'll need to have a new cam in mind for that they're usually matched to be compatible.
What kind of rear suspension do you have ?
