Spun a Rod Bearing..FLORIDA Help!

A rod knock is usually heard, after revving it, and letting off the gas(no load). A main makes deep knock under load.
so why not pull the heads, and pan; swap out the crank ( new rod needed if that is the problem). Cheap.
Re-read, saw spun. New rod and crank. Pain, but I've done it, laying under the car.