Oh Man,,, I had Several 318s hanging out, one w/ a triangle Alt tensioner/ mount... I ended up going with the one long banana shaped one( thinkn off the 273) it's been So Long, and, well, kinda Frankensteined) I Caint Remember. I do know once I got everything straight with the crap I had laying around, other than having to buy a different bolt kit, from Pro Kits, I've had No issues, Except: I think, cause the Pulleys are from the 66 273 a/c mill, the way I have em ran, requires an odd, non factory belt. The good thing is I have a belt from the crank to the alternator to the water pump and I've got another belt from the crank to the power steering to the water pump