Has anyone done this switch?  I've come into some money recently and am looking to spend about 20k on this car.  I am buying a 514 cu ford motorsport engine making about 625 hp out of the box. And I am putting a 200 hp plate system on it.  The problem I am having is what else do I need to upgrade to keep the car from twisting. I know I need a new trans and I am looking at an automatic.  What axles should I use? What electrical?  I figure people on this board would know.  I also have to tie the frame up.  What should I use for that?  Lol I have alot of questions due to this being alot different project than my other mustang.  

My friend did a built 460 swap on his 90 lx.  Heres what he had to do. First off, the stock axle will not hold up to that kinda power, I dont care if someone says yes, it will eventually fail. Step up to a dana 60 or 9" rearend.  Although if you have an 8.8" rearend, you could build it to handle that kinda power, but it will end up costing more than a junkyard axle swap.  You will want to go with at least 31 spline axles. Next, to keep it from twisting, you will need to put a rollcage in it.  We put subframe connectors on my friends car, and it still twisted alot(hes got around 850 whp), so we put in a 6 point rollcage.  We used a c-6 with a 4500 stall that we had built to handle high horsepower.  As far as electrical goes, we used msd everything.  Just bought parts for a 460 .  We used just slightly upgraded electrical components, nothing with "race" applications, and he runs a 10.14 1/4!  In total, he spent about $11,000 for everything.  So I guess if you wanted a little more, spend more.  But Im just using him as reference for what he has.  His car is fast, simple, but reliable. Hes had this setup for 3 years now and races almost every weekend.  Im sure you have heard of alot of waht Ive told you, but this is just my 2 cents.