well w/ a rex and the right tuning w/ that I wouldn't think it could be to hard....the only thing is not sure how streetable it would be once it was tuned for the 11's..
big thing for that would a P&P head and blueprinted/balance block internals and crack etc. upgraded low compression pistons and rods,block guard for safety, titanium valvle springs/retainers, fuel pump upgrade/rail etc..
Just to name a few things involded pretty much..good luck w/ your goal for the 11's..
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