I have an magazine article documenting Royal Pontiac doing just that.
Originally Posted By bigchief
Myrtle motors in NY did conversions with 428's
No arguments on either point here as I have heard similar stories, but as was noted in the original post about a factory installed 428, neither of these two situations meets that criteria.
1968 400 Coupe, verdoro green, black vinyl top, auto 1969 GTO Judge coupe, Carousel Red, manual 1971 Trans Am, cameo white, auto 1970 Buick Skylark Custom Convertible 350-4(driver), Fire Red, white top, auto 1972 Buick GS Stage 1, Royal Blue, black vinyl top, auto
