Quote:

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I think the Stengal 78-581 is the 68-69 340 leaf spring.

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Click on that p/n and the link shows the Chrysler p/n.
Now you made me look at my '68 Book CD
It still looks like that Chrysler number is only for some 383 equiped L, & B models 1967, 1968, 1969

1968 Standard
Valiant, Dart 225cid 3004 581
Barr H T 225 3004 582
Barr Cnv, Ht Spcl 225 3004 585
Barr 318, 383 3004 588
Dart 318, 340 3004 583

Heavy Duty from the '68 Parts Book:
V,L /6,273,318 3004 584
L2-S 340 3004 584
B exp 383, 3004 588
B 383,L2-S383 2808 677

My notes are that the '69 Parts Book give the following spring numbers for both the 318 & 340 cars.
V,L,B 3004 584
Presumbly this is the spring used in '68 340 equiped Barracudas. I don't have supplementals for books.

To confuse things a bit, from the Chassis Manual, Ralley Prep, page 58:
340 H.P. 3549 059 110 lb/in 0" increase

Looking at the part parts books on Cd helps correct my notes, correction made in previous post regarding applications.