At your age with your current driving style, you'll kill yourself with an LS1/RWD vehicle. I have trouble enough controlling my car when I romp on it, I'd hate to see someone as inexperienced as you doing the same with a RWD V8. It's an accident waiting to happen.
More power to you if you get it and your parents approve (let alone insurance costs).
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne