Do I need a new converter?

Frankly, its still roughly 1/2 a second slow in what it looks like it would run in the quarter( maybe 11.50’s)
That time slip is almost a tenth off from what my similar compression( mine was a little less) stock stroke 360 ran this past season with eddie heads i just found out were little, if any, better than stock( they went 255 max)
My car weighs within 20 pounds of yours. Has same intake, smaller headers, same gear. But more cam and convertor.
If i had to guess, assuming the FI is doing its job, i would still suspect the camshaft is a big power limiter, and correspondingly would want more flash with a bigger cam. Makes me wonder too about the heads
Stroker should be 3/4 tenths quicker than a stock stroke deal, falling off a log, all things similar.