I knew a guy who insisted on using a used set of aluminum rods on his blown sbc. We called the car the lil green booger. He spent 6500.00 rebuildoing his entire engine using used high dollar parts.
22 runs later after running 8.20 all day he destroyed his entire engine rods and pistons sprayed the track, But she sure ran.
It is a gamble, heck you could buy all new parts and have they same thing happen.
Seems to me your taking more of a chance on used vs. new
Maybe try to save a buck somewhere else and spend a lil xtra on the bottom end.
After all The Bottom End is the foundation of raw power and Preformance. Use it, Don't abuse it!!!!!!!!
If your gonna abuse a bottom end, abuse the lil ladies. The cost of repair may be just a lil cheaper.