A line out of "Pretty Woman".... It's okay... it happens all the time.
I was rebuilding the 427 SB (Dart Little M block) in the Nomad... and changing it to the 8 stack efi manifold at the same time. I had a set of Canfield 220cc raised runner heads (angle plug) on the original build.... went ahead and ported them - new springs - guides - etc.... THEN last to go on.... the intake manifold. Well the 8 stack used a Weber manifold (old skool to the max)... and guess what... no way was it going to cover those big old ports. Misc options - spacers - weld and mill the manifold etc... but then that messes up all manor of other things.... so we go to the shelf - no problem - grab a set of AFR 195's with angle plugs and bada bing bada boom.... engine done.... then another oops... those heads wouldn't work with my headers (angle vs straight) so new headers...
I chock this up to HOT RODDING.... sometimes you just have to laugh.... even when it kills ya.