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I would do cams and heads...not necessarily at the same time but yeah. The sound is nice and the gains are great. Or if not id do suspension, to get it to the ground easier.
If i were you, i would do a 31 spline axel swap and do suspension work. Get some 31 spline axels and diff, good u/lca's, adjustable shocks and struts, and some real nice drag radials and call it a day. But after you do that, you will get bored really fast because it doesnt do anything for power...it would probably even make your car less fun to drive. But it would get the power you have to the ground better and safer.