Currently, there isn't a direct option to truncate the body text to 800 characters in the Scrape Website enrichment. The enrichment provides options to control what content is included in the body text through the "Keep Non-Text in Body" parameter, but doesn't have a character limit setting.For reference, Clay's text fields can hold up to 8,000 characters per cell, so the full body text will be stored up to that limit.
Source:Scrape Website with Clay