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Yeah hard to price these days guess it comes down to how much you want that particular car & what is the limit you'll pay.
Look up v6 vs v8 specs you'll see what speeds they're supposed to get in 1st or 2nd then compared....v6 g/box had super short & almost useless for a v8...also needed the input chopped down to suit or back in the day aftermarket bellhousing.
Should be code tag or numbers cast on side to work out what g/box 'might' be from....if it has ford 6cyl t5 conversion with aftermarket conversion kit wouldn't be too worried about that better ratio box & way easier/cheaper to replace,,,,check speedo is correct with gps from phone app.
Does that airbox have big one piece snorkeo facing forward like sv items?
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Worth some coin but moreso cool item to have these days.