Comp cams xe268h for 318

Let me clear up the engine build. I screwed up from the beginning. I had a good running 318 from a truck that I bought for parts to fix up my 85 every day driver. So I pulled the engine and had planned on just freshen it up with new gaskets but then I figured I'd go ahead and get a new cam too since it was already gonna be disassembled. I had a 340 intake and headers and a Holley carb laying around from years ago so I figured I may as well use them too so I just ordered the cam without asking questions. Then a few months later I started a thread on here basically to just get ideas about what I should do with my build as far as timing chains timing carb settings etc. But everyone told me my combo was crap so I ditched it. Now several months later again iv saved up some more money and was gonna get a new cam I was just about set on the luniti voodoo but then I a good deal on the comp thus the creation of this thread. The xe268h was never in my consideration I just found it and it was a good deal I figured I should ask. But after this thread and reading alot of other threads I'm just gonna stick to the original plan build it. So here is what I have I have a 86 318 "302" heads home port job. Summit 6900 cam 278/288 duration 421/444 lift 112 lob separation matching lifters stock 1971 340 spread spreadbore intake and a holley 1850 carb and full length headers 2.5 dual exhaust. And I have a set of new thrush mufflers I may or may not use we will see how loud it is.