I dont know what was put in this motor except the cam has a 302 firing order,it was supposed to have 8.5 compression as I did not want to use premium and I think the heads are junk smog heads. I got it in the big garage now getting it ready for summer driving and will be doing a compression test and trying to see what heads it has,I have to run premium as with a stock duraspark distributor it will ping badly and I had to disconnect the vacumn advance or it would be worse.