360. Cheaper because assholes think the 340 is priceless. 360. Because the longer stroke delivers more torque at a lower RPM, perfect for the street. 360. Because they're easier to find.
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Das more like it! Although it's a TRW replacement, it's still about the same as the 68-71 piston.
That's always been one of my dream builds. To build up a blueprinted 71 340 dead stock but with the 68 4 speed cam with everything machined to perfect spec and stick it in something light.