Predict my E.T ....

T67POWER said
Convertor...........needs at least 4500 stall.
340'S run better with gear and stall.

12 seconds on juice....13 seconds on motor.

With convertor....12 seconds on motor and high 11 seconds on juice.

That's a really big tire for 3.91's.
I believe it's a 30 inch tall tire.

That's like running a 28 inch tall tire with 3.23's.(2800 stall)

It's 60 foot will be very slow.

pettybludart said
While your engine is being built,find a reputable torque convertor supplier and give him all your specs(tire size,gear,camshaft,(spray),suspension,intended use for the car(street?track on weekends?)The convertors made today are allot different than 10-15 yrs ago.Often an overlooked part for any type of street/muscle car build.

340s like to Revvvvvvv 2800 stall is way to low. with todays converters you can get away with a lot more stall and still be streetabe.

I Have 4.56 gears in my 340 and, like you, a 2800 stall. My 60 foot times are 2.2s(3760 E body) and ran low 14s at 4400 foot elimination.
If your 340 is like mine, it just don't pull until around 3300 rpm.

When i launch, even with 4.56 gears it's real flat. just past the tree it come alive and runs down the track.

With all that said I'm with T67POWER.

"12 seconds on juice....13 seconds on motor.

With convertor....12 seconds on motor and high 11 seconds on juice."

I really thing a converter (quality converter) Is well worth the investment.