Whats a good price for a 74?

You didn't say if 2 door or 4 door. Even 2 door has variants - hardtop or post (not sure about 74). 4 doors go for much less since not considered sporty. For practical daily driver a 4-door slant six is great and you can get fairly cheap since little re-sale value.

Like ESP4, I see 74 slant sixes sell for ~$1500 in Sacramento, and that is minimal rust. Some ask $5K, but that is usually people who inherited the car, see a few car shows and think all Darts are worth $10K, so they price lower since faded paint, etc. A long ways from theirs to the show car, and no way to get a 4-door there.