04 3.9 Mustang rebuild, need help.

04SN95mustang

New Member
I have an 04 3.9 mustang I'm wanting to make 500wbhp out my stang would it be best to rebuild the 3.9 with 240 000 miles or get a new 3.8/3.9 or just go for a 4.2 ?
 
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