Since your 258 crank is from an '89, it'll have the same snout length as the 4.0L crank and you won't need to shorten it. The 4.0L harmonic balancer will be a direct fit.
Given your mild set-up, I think the 24lb injectors will be enough on their own.
Junkyard stroker
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Re: Junkyard stroker
1992 XJ 4.6 I6 - 5MT - Stroker build-up, Stroker "recipes" Sold
1995 Mustang GT - 4AT - Modded Sold
2006 Mustang GT - 5MT - Modded Midlife Crisis Car
1995 Mustang GT - 4AT - Modded Sold
2006 Mustang GT - 5MT - Modded Midlife Crisis Car

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