/6 random thrown rod

hey guys so i took my '73 duster to jiffylube to get the fluids changed cause here its really wet and rainy so i didnt really wanna change it myself.Before i went there it was running good and the oil ws about 1000 miles old but i wanted to change it co i could have the oil change sticker to remind me. then i started driving down twords my friends house to pick them up and when i started getting a little bit down the road it started knocking a little bit which worried me cause it had been running great up until that poing (with the exception of when it was cold). so i was trying to find somewhere to pull over then it started nocking really bad and as i was pulling into the nearest parking lot it died.so i started push it and luckily a guy helped me push it mostley out of the way. so i called AAA and arranged a tow that took 3+ hours to get to me . this meant i had a bit of time to just sit. eventually an older guy who had worked on a crazy amount of a bodies came over asing me what happened. so i explained everything to him and he check it out. he had me crank it and it accidentally started and it sound bad loud metal on metal. he was the one who said it was a thrown rod and when i told him that i had just got my oil and everything changed at jiffy lube and only drove 8 miles since then he told me to call them up. he said that if the oil filter is messed up it will throw rods. so i called up jiffy lube and the main guy there came out and looked at it and called his boss. he agreed that this was crazy because it wasnt acting up before but than this happened. so theyre going to call me on monday and take it to their shop to look at it closer and see if it was their fault. well i guess what im wondering is has anyone else had this happen or heard of this happening? i have a second engine and trans but neither are in running order so this really sucks.