Plan on doing a build in the very very near future.

ls block and head eagle rods and srp pistons (thanks to strictly business, thank you sir!) and somewhat built ls head. I want to run a 75 shot max i decided on the high compression motor usually 50-65 shot tho. Im going to be using a dry kit, but my questions is Would i need injectors to spray 75 shot or would i be fine with a fuel pressure regulator?

i know you have to retard your timing a bit to go that high, but i heard from others that if you retard the timing all motor without spray it wont be as quick as if the timing was at its regular state??

Im not sure on any of the things im asking thats why im asking! rep will be givin for any useful info ofcoarse.