Hi. I have received a lot of great information and I believe I think I know what I might do. I found out I currently am running a mismatched Quadrajet from a 69 350 on my 68 GS400 and it is running poorly. Since I need to rebuild, may as well see if anyone has a good complete core or a decent running one with these numbers I obtained from Mike. I am not running a race car or built engine, just a weekend cruiser. 400" Eng (Early) A/T R-4-4MV 7028242 (Late) A/T R-4-4MV 7028246 430" Eng (Early) A/T R-4-4MV 7028240 (Late) A/T R-4-4MV 7028248 Thanks for everyone’s time.