are you serious??
200hp from a 3.8?? thats perthetic, seriously its very very gay. a guy on here has done his conversion into a earlyer ke and he calls it a led tipped arrow, it majorly f@$ks up the weight, not so much by adding it just it moves it forward of the cross member..
anything will fit, may as well just put a 253 V8 in. has been done to a t-18
if your doing a conversion may as well do a desent one with a desent motor for the work thats involed.. a non turbo 2jz would be a better option, most probaly lighter and puts out more power... in standard form
another option is a 20V, its alot easyer of a conversion and it makes desent power in standard form and it would be able to be passed for rego because you arnt increasing capacity or cylinders. you can also use all the engine mounts/box. they are cheap these days.