Might also try bumping up the initial timing a bit (2-4 degrees or so) and back off the curb idle screw on the carb a little and see if that works better.
Then check the total timing and swap the limit bushings if needed to limit the total to what you want it to be.
And check the timing at idle (in park and in gear w/brakes applied) and make sure the advance is'nt kicking in early,it should'nt be with that spring combo,but check just to be sure.
A hydraulic like that will like a little more initial timing when it's run with an auto-trans.
Convertor should be OK.
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