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Ok, so I know you are talking about my old Supra. And yes, for a car that there is no real convenient engine available that would be an improvement, more boost/stroking the engine is better.
But it's a fucking Mustang. The cheapest V-8s with the larget aftermarket EVER PRODUCED. There are smarter option that a stroked 6-cyinder. If making more power with less size is what you're after, get an import...domestics don't know how to do that.
Unless you're deadset on keeping the sixer, I'd look for a windsor based swap.
I have a buddy with a blown 4.2, its nice and all but for the amount he put in it a nice 3xx swap would have been better.