Might be best to sell what you have and buy a new set of rods.
35 yrs ago I was a mechanic in a Shell station. Had a customer that spun a bearing in a Porsche 944 S.
I took it all apart, had the crank cut and got one brand new rod. I went back and forth to the local deli
and had the rod weighed on the cold cut scale. I ground a little at a time from the cap until it matched the original.
When I was done I remember thinking it looked a lot stronger before I touched it. I put it all back together and it ran great.
Not sure how long it lasted