Well a stock 5.0 with just suspension, slicks, 3.73s and a catback run mid 12s. Bone stock they run 14.2. with gear and a catback they can run 13.5. So my bet is the 5.0 fox. Now if this was a 94/95 5.0, that would be a different story.
My buddy has a 5.0 with 330k on the shortblock and it's been making 278rwhp since 188k. They are a more durable motor then you think.
2003 ZX5 MTX: SVT Suspension
1987 GT T-top