Torq converter cam make a world of difference. Not sure who's good now, but I know dynamic used to make a good street/strip converter that'd flash stall to 4-5k yet drive basically normally during regular driving. Something like that would be a night and day difference for your car. If you go to a high stall like that, you can leave your rear gears as-is. If you do the stall, the gears won't make much of a difference.
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the exhaust manifolds are not the problem many F.A.S.T. cars running low 11's with them.
True, but the fast guys are also going to be running ported manifolds, higher compression and often stroker cranks. But for his application HP manifolds should do the job decently.
