Can't go wrong with Andrews 57h...great drop in cam for the 103. I'm sure you'll get alot of good suggestions so figure out where you want the power and work from there. Don't forget a good tune, Happy hunting
Seems Cycle Rama 570-2 are the latest hot setup drop ins for 103s...but yeah, while ya can pick up some good hp with a cam swap, ya aren’t gonna gain much tq without head work on a Rushmore.