sadly other than good tune up . No much can be done for that . Cams,head work really can be pricey
300-6 snorkel and insulate air box including all tubes . , heavy Hi po plug wires, copper plugs ,bump timing , hipo coil That will take care of the $200 (i do this on All my trucks And I had 20 plus )
Free up exhaust helps . Long headers for max performance . But shorty r better than stock ones. A hi po Cat if you need 1 .
Or if have good cheap u pull or know of a 94 up MAF equipped truck . Do the swap . MPG improvements and it peps them up . (Less than $100 in parts here for 302 351 300 6 with harness and air box . Swapping harness the hardest part and some re pin work .
Might be able to get a new muffler put in for under 200... I don't like the look of the factory muffler it just screams power robber. But i have no proof of it...
If you're more worried about perception that actual power, you could just buy $200 in go fast manufacturer stickers, and put them on your back window. Keep in mind, you're talking about a big, heavy, brick and only $200, not much can be done.