273 LA bored .040 change in performance?

I was just curious it it made any difference. It had a rattle in the bottom end and we found the #8 Rod bushing was worn and had slack. All the rest looked good and no wear in the cylinders or journals. I'm replacing the hydraulic cam with a Comp cam kit and it has an Edelbrock 1406 four barrel and 75-80's intake(shown in earlier post). It ran strong but the rattle worried me.
I tried taking hood, doors, fenders and back glass out to lighten it but being winter time and snowy I backtracked!! Ha!!
Terry