[scott70]

Yeah mine is not a daily driver. I take it out when I'm in the mood or have a minute. I actually googled the tkx thing and found some other forum opinions...found some were asking about tkx overdrive in the same configuration as mine ,gears,tires,etc......68 vs .81.....opinions were down the middle 50/50 also. Like was said either one is fine...try to figure out your expectations I guess.

[Formulajones]

Originally Posted by scott70

Yeah mine is not a daily driver. I take it out when I'm in the mood or have a minute. I actually googled the tkx thing and found some other forum opinions...found some were asking about tkx overdrive in the same configuration as mine ,gears,tires,etc......68 vs .81.....opinions were down the middle 50/50 also. Like was said either one is fine...try to figure out your expectations I guess.

Yeah you'll get that basically because you have 2 groups of people. Those that struggle to get an engine to run at lower rpm efficiently and those that can.
So you end up with 2 different opinions on overdrive ratios.
Been that way since these swaps became popular 30 years ago.

Usually when I do these swaps I'm also digging into the carb and distributor to tweak and make the engine a little smoother at lower engine speeds.

It's also where electronic control lock up converters have a big advantage in auto overdrives compared to the TV cable mechanical stuff. Not only can I dial in the converter lock precisely but making the engine happier allows me to keep it locked longer.
The only difference here is your left foot is your lock up converter

[scott70]

My 7040267 carb has no port for vac advance. Talked to cliff,,he has added the nipples before on these carbs.