the iron 4V head design really likes more ci, (400+ci) adding another 100hp wont be a issue with right parts combo concidering the stock 1969 351C can make 350+hp... https://forums.corral.net/forums/351...refreshed.html
think as far as standard dp 4barrel intakes go you would need to use the Shelby/BlueThunder repo version & better exh to get higher hp#'s
do you by chance have a link to that Hemmings artical?
!Grab em by the p*ssy!... !TRUMP 2017-2025! ...!make America Grab again!