Before I make a mistake please help new mopar fan!!

I had a all stock 73 340 rallye charger in high school. Was only one other faster car. buddy of mine had a '71 camaro with a 400 small block. My car was even faster than a 1970 SS 396 chevelle and a 1971 SS 454 chevelle. That was also the lowest HP ratin 340 that was made. Had 8.5 (at best) compression and a cast crank. If you can get a 340 for 500, you better do it.