Your converter may be tight for the RPM range of the cam, just from a quick look at the specs. What RPM can you flash the converter to? Once you get the stall matched to your rear end ratio, then maybe some 1.65 rockers will help. I'm positive that you are bogging on your converter and it is feeling like a dog until the revs come up, just as the trans shifts to the next gear and you are back on the low side of your powerband and it feels slow.
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