351 Windsor swapped 92... What manual trans can i use???

Are you drag racing? Road racing? Street car?

If drag racing is your thing, Lenco, G-force, Jerico, Liberty are your better options. You will want to load the engine somehow at the line to leave with boost, 2 step, whatever. Then down track you're going to have to stay in the throttle which means clutchless shifting. The Lenco is probably one of the better choices but they are heavy and a little power hungry. You won't hurt it though.

Jerico and Liberty will work as well on road racing. Neither is very street friendly, however. Kinda clanky, little hard to downshift, etc. But with turbocharging, it's probably not very road-racing friendly anyway.

Street car? You'll want something synchronized BUT the downside is you'll have to learn to shift really really well if you plan on drag racing it, to keep the engine loaded between gears-so that the turbo stays spooled. I can't shift that well with a synchronized transmission and I've been a manual-trans racer since the beginning of time. Clutchless? Different ballgame--but has it's downsides. Never used a manual with a turbo aside from my '93 coupe which is a 4 cylinder turbo like the old SVO's were. Fun but not all that powerful. Even still, first and second are worthless. Third is too in cool air and/or wet pavement. Just a standard T5. Running 18 psi, basically a stock engine with a couple very mild and common mods (exhaust, intercooler, and intake). Maybe 270hp?? Never dyno'd it.

I'd also vote for a call to Bob Hanlon.