Yanking the 6 and dropping the 8 took a lot more than a V8 K member...it took a hell of a lot of time and patience and "persuasion"
That's always been the meaning of shoe-horn to me but maybe you're using some other meaning that I've never come across.
Don't really feel like getting into an argument about polyspherical vs. hemispherical designs
Versions
The first version of the 318 was known as an A engine and had a polyspherical-head design that was similar to the hemispherical head design of the famous Chrysler Hemi engines. This 318 engine was built from 1957 to 1967 and redesigned in 1967 to produce the more common LA series 318 with traditional cylinder heads. The basic LA version 318 stayed relatively unchanged until 1988 when roller lifters, fuel injection and a new swirl port head design were introduced. This redesign in 1988 resulted in the basic changes to the 318 that Chrysler later in 1992 called the "5.2 Magnum" engine and was used as a performance option in trucks.
The first version of the 318 was known as an A engine and had a polyspherical-head design that was similar to the hemispherical head design of the famous Chrysler Hemi engines. This 318 engine was built from 1957 to 1967 and redesigned in 1967 to produce the more common LA series 318 with traditional cylinder heads. The basic LA version 318 stayed relatively unchanged until 1988 when roller lifters, fuel injection and a new swirl port head design were introduced. This redesign in 1988 resulted in the basic changes to the 318 that Chrysler later in 1992 called the "5.2 Magnum" engine and was used as a performance option in trucks.

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