Seems like alot of people have been doing this or thinking about it,I know i'm in the process of doing this,with just an 87 ho block,gt-40 heads,700cfm carb, Ford e-cam,lifters,1.6 rockers. Sorry not trying to threadjack. Just seams kind of dumb to do an sr20 swap to me,I know the sbf swap is a litte more involved but well worth it in the end.Yeah I was surprised to findout just how strong the stock rearends are in the s13. And I know where I live(tampa area) the ls1 swap in s-chassis has caught on real well. But one more question is how bad was it mount the trans up to the 240sx crossmember or did you have to do some fab on that aswell? Thanks for the info on the f-150,I havn't gotten that far yet,just finishing up the motor for now and prepping the car. Anyways goodluck man,hope to see some more pics soon.