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Will a turbo 350 bolt up to the 4.3 from 88 astro?

No, a Turbo 350 transmission will not directly bolt up to a 1988 Astro van's 4.3L V6 engine. The 4.3L in that Astro used a different bolt pattern and possibly a different bellhousing than the Turbo 350 was designed for. You would need an adapter plate, and even then, it's a significant modification project requiring expertise and potentially custom work. It's not a simple bolt-on swap.