Have an opportunity to buy a 1974 Roadrunner but engine has issues and there is a hole in frame. $2500 fair price?

Look all in the cowl REAL good because that's where those cars are bad about rusting out. Open the doors and look forward of the hinges in the area forward of the firewall and under the cowl. Also look as good as you can into the cowl vents and look under the dash at the inside part of the cowl and around the corners where the cowl and the kick panel frame come together. If it's rusted out in any of the cowl area, I'd get it running and driving good and flip hell out of it.