It would easily cost you more to build up a windsor to 700Hp... Or any Jap 4 for that matter. Only better 'bang for buck' engines would be an RB26DETT(GTR) 2JZGTE(Supra) or a 20B Triple Rotor Turbo
But the question is how much power do you want?
Oh theres a 700Hp+ Turbo XR6 for sale for $18k on
www.performanceforums.com. ...