How much ET will i pickup with following changes

Don I'd say .3 is pretty close, the converter is going to help a bunch. My old pump gas 340 ran 11.60 with 1.54 60's with a 4.30 gear and a 275 radial. The 4.30's after 3.91's picked it up less than .01 in 60' and not much more in the 1/8.

I'll be watching as I still haven't ruled out a 904 for my Dart.