will a aftermarket throttle body work on a 1994 mark 8?:)

Ive heard from some that a TB swap is not worthwhile.

You will gain nothing. Modify your stock throttle body tube yourself by removing the air resevoirs on the TB and cap em. Then get a maf adapter to hook up a conical filter. Your results will be the same if not better and you'll only have to spend about $60.

Here's a pic about what I'm talking about. I bought a maf adapter from TroyerPerformance.com to hook up a conical K&N filter.

the only real gain you would get is if your old tb was a piece to began with.

I agree not much gain , unless you have a way to exit all the extra air (better exhaust) and some kind of chip to take advantage of the upgrades.