I agree welded crank, solid piston, and a good port can get you good power.
Update on the cheap build, ran a few heat cycles, ripped around the block a few times. It doesn't pull as hard as it did before but has a more predictable power band. Running a 310 main, 27.5 pilot and middle clip on the needle, 2000'elev. This summer I'll be back in southern Utah at 6000' I'll provide another update then.