I did the forbidden swap. No, not the LS LOL

I got another 15 years before my youngest is out of the house, nicer heads are going to have to wait a minute.. in the meantime though these heads are flowing better and saving me 50 lb over my original Magnum heads so I'm as happy as a hog in slop at the moment
Would you happen to be the guy with the x head on magnum idea..?