I was wondering if any one has put rods and pistons in these motors with the engine still in the car any problems with the engine balance? thanks

 

its been done but its not ideal

 

I'm not going to be taking the car past 8k

 

what he said. it's not about 8k it's about doing it right. If you're gonna rebuild an engine do a proper rebuild. Take her apart clean her check the build for the proper specs and put it all back together in better then new condition. The crank needs to be removed and balanced for a proper rebuild with new rods and pistons, anything short of that really is half-assed.