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Since this is a question and answer forum, doesn't economy vs performance come into play. There are a lot of 4 barrel cars out the and not very many 6 pak cars. I will be replacing my Holley 750 DP with a Thermoquad. I'll bet I get much better gas mileage and more power(faster) at the strip. I have already tried the race on an engine dyno and the car was a pig at the strip. I changed cams, put on a dual plane spread bore manifold, took out the 4.30's and put in 3.23's. I realize now that a big part of my problem is a 410 stroker with Diamond rectangular port aluminum w2's. No torque down low. I'll let you know after I go to Sacrmento in September. Top gun dragstrip @ 4000' won't tell me much. The car ran 13.54 @100 mph at Top Gun in June. It didn't even start to run until 330'

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Would you up the gear to 3.90 for a comprimise with the TQ. 3.23's may be a bit too high, I could be
wrong, since I don't know how high your torque
band is and converter's stall speed if an automatic.