NASA couldn’t build those F1 engines again, the design is there but the knowledge is dead and buried. Those engines required specific techniques in welding and baffles that died with the builders in the 1960’s.
There is a great series out there called Moon Machines, it goes over how they build everything in the Apollo program from the engines, to the suits to the computers.
Raptor engines are very well designed, Starship is much bigger than the Saturn five hence the large amount of engines needed. It is true none the less that the F1 Engine was a one of a kind. NASA should just scrap Starliner.