hey rusty,
funny that you are talking about putting a willys body onto a s10 frame..... found an add in the street rod builder magazine that poked my interest. takiong a totaled s10 to a ground pounding willys. tried their web site... no luck not working. <a href="http://www.activepowerinc.com" target="_blank">www.activepowerinc.com</a>
here is their Phone # if you need it(or would like it) 440-392-9937 . if you get through(like it is a legit business)tell them their website ain't working. as for the 400 HP, i have to agree with Stinking. 300hp no problem, 400, you would be looking at a minimum Chevy 8.5 instead of the puny 7.5 it comes with. then again i have heard that you can pull the rear from a late model s10(suposed to be a 8.5) as long as it had the 4.3 v6. somewhere in the later 90's works best. hey might get lucky and find one with discs.
later,
JS 