Haven't run it yet, it came with the correct cap and rotor for that model and all the parts there are in good enough shape I'll clean them up for when I do run them. I'm pretty sure it's also for a big block/hemi and not a small block, but I haven't compared my old one to this one so I cannot say for sure, looking on ebay the big block ones I've seen have a different number stamped onto the housing so it could very well be for a small block. I don't run vacuum advance currently on my 340 with the stock electronic dizzy, so I have put more initial into it to compensate for that so I'll probably do they same for when I install this unit. Currently in college so I might buy a motor home big block to tinker with.