340 cam for 318

junkyardhero said
also, there's only two 340 cams: 68 4spd cam and then the other one. which is... wait for it... also the 360 4bbl cam!

Bingo! The knit time I have seen something different is when the smog years came into effect hard, ‘76, ‘77, etc….

MoPar would equip the cars with 4bbl carbs and use a 2bbl cam. There are various amounts of 2bbl. cams out there.