The stock V8 TC is a fairly high stall for a heavy production truck. It jumps off the line very quickly with the stock 302, I see mine shift at 4500rpm or more all day(near 5 hours) at work.
The stock 302 is a decent mild OEM combination, the heads/intake/cam all are better than old typical stock parts. But they are all still not performance level parts, their rpm band is from idle to about 5k. Unfortunately prices have sky rocketed recently, decent aftermarket new heads used to be $1000 or a little more. Now those milder heads are closer to $1700 or more, the next level stuff went from $1400ish to now $2600 or more.
So upgrading any SBF has changed a ton, what before you could do a lot with $1500, now plan to double that, or more.
The stock exhaust is horrendous, not simply bad, but extremely bad. Changing that is a big deal cost wise, but get ready for it. The cam you might best plan to R&R the entire engine to get at it and the water pump, timing cover bolts etc. The stock cam isn't terrible, the 302 HO cam is a little better(and cheap choices), all other new cams will be high and plan for new valve springs. Rebuilding the heads should be the least to do with a new cam, but new heads you want if the budget allows.