Information on a 340 for my 69 dart

My only 2cents would be run the A833 overdrive, and combo it up rightly, cuz gas is never gonna be cheap again.
As for engines you would need one of;
a hi-compression LA318, or
a stock 5.9M
a lo-perf 340 or,
a more or less stock LA360. Any of these will get you the powerband you need to pull that overdrive box with 3.23s,
for 65=2100 rpm, yet have a nice starter gear of ~10/1. Which is more than you need in a lightweight-A with short tires.
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If you can afford the shipping, (about 1600 miles),
I got almost everything you need, from front to back, out of 67 to 73 cars, including;
any LA-SBM core, including 340s,
4bbl intakes and carbs, log manifolds, etcetera
any A833 trans, rebuilt or reconditioned,
Everything between engine and driveshaft; maybe even engine brackets
shifter, and pedal box (67)
any 67>72, 8.75rear end; core or reconditioned,
gears from 2.76 tp 3.23.
reconditioned SureGrip,
plus suspension/steering/brake parts, and
KH disc-brake system.
Missing would be;
a 4-speed tunnel/console/and reverse indicator.

Except;
the 360 is a 77 and is complete.
If you have a pre 67 car, they say my F-body od BH will not fit with factory available OEM Z-bar brackets. You would have to fab something up.
Also available ;
I have a sweet kitted A904 with a 2800 stall, that you would absolutely love.
Got some 14"wheels too; Rallys or Slot-Mags..
I'm yur one-stop shopping center.