Didn't think about the heavy car. You should hit your goal with your mods depending on the cam. Your best shot is to talk to a knollegable Ford tuner that offeers custom cams. Explain your current parts & make sure you mention the weight, it should make a difference. Your gonna need some grunt low to get that thing rolling.
307 rwhp on my car went like this:
Edlebrock Performer RPM
Crane 2040 cam
Stage II TW's
Full length headers
73 mm C&L
24# injectors
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