you should not need compounds at 400hp. IMO thats total overkill. I did a 95 conversion alot like yours yours as few years ago that was 600 hp and lit immediately and had a single turbo. You can get 400HP pretty easy with a p pump. Is your truck lifted or 4wd? i had a ton of problems with oil pan clearance on the front diff. Twins are cool but for what your wanting i think you could make it more streetable with a single. Unless you want twins for the cool factor. If thats the case, stack em on in there!

I just read your build thread two days ago, good job. I want twins to make sure my EGTs stay in check while towing, have a fast spool up, and yes the cool factor. The twin setup should be more streetable than a single because the factory turbo should spool faster than a larger single and then the other turbo kicks in providing adequate airflow for higher HP. Plus it keeps the drive pressures lower. I am a little concerned about fitting them in there though. What did you use for your turbo pushing 600HP?

all said and done i ended up with a silver 62 from industrial. it lit quick and would slam you back in your seat. if i had to redo the build i wouldnt ever do it again. There was alot of problems fitting that engine in that truck and making everything work right. the ford trucks are 10 times easier to fit them into. my egts on that setup never got hotter than 1300. even towing heavy loads up grades in 100 degree CA heat.