Your challenge, should you accept it, is to have Francisco Franco not select Juan Carlos as Prince of Spain in 1969 (which will be the year of the POD). This will leave the path more or less clear for Carrero Blanco to succeed Franco, when the latter dies as per OTL, as the new "Regent" and "Caudillo de España, Por la Gracia de Dios" and thus continue the Francoist régime. In order for this to work, you would need to ensure that Carrero Blanco would have to survive all the assassination attempts he had, including avoiding the 1973 assassination by ETA (so no more World High Jump Record Holder jokes ). Bonus points if he survives to 1993/1994 (take your pick of which year) and dies in his 80s. Double bonus points if you can describe what Spain would be like under Carrero Blanco, as well as an idea of how a delayed *Transition after Carrero Blanco's death would look like. Triple bonus points if Spain gets a nuclear bomb by the time Carrero Blanco succeeds him (or at least very close to completion).