I agree w/ Wize the 3.55's shopuld be ok but you really need more convert. If you are rolling at 40-50 and step into it there should be no lag. I'd probaby up the primary 2, check your PV, try a lighter spring in the outboards and possibly change the pump shot. What sort of timing are you running?
as for times... a 440-6 with decent parts, 509 cam, 3200 stall and 4.10's in a big car can run 11.70's
So far 11.389 but I just got my 2" headers. (old ones are 1 3/4") I'm going to get those on, try some drag shocks and see if I can't pull and 11.teen this year.