Change 1-2 gears to lower ration gears 1967 Dart Automatic (904?)
How about low compression 273? If it can have a bit more get off the line id be happy espically with a highway ratio rear.
IMO,
You'd be miles ahead if you just bring up the compression.A few more bucks,I know, but more torque, more horsepower, and more mpgs.
But , a fair bit cheaper is a slightly higher stall TC. I'm a really big fan of the 2800 for a 318, and so I'm sure it would be just as great behind the 273.
But yes, the 273 will like the lower first gear...... but sooner or later she's gotta get into second. :(
When you put that 2800 in there, the rpm will rise some 1000 rpm higher on the start-line, than it does now. And I'm guessing your torque delivery will potentially be nearly double. That's a 100% increase.
The low gear in that A998 is 2.74 ratio, compared to the A904 at 2.45. That is an 11.8% increase
Lessee; 100% versus 11.8%
Depending on the importance of hi-way fuel mileage, you could get away with less TC, But I wouldn't go less than maybe 2500, which should be some 750 rpm higher than a stock 1750 .The difference in horsepower delivery between 1750 and 2500 is; I'M GUESSING, 80 ftlbs which calculates to 50/55hp. That will boost your take-off................................big :) time...................And you get to keep the slightly closer-ratio A904