Think this question is funny, you should see all the questions on reddit from gomers who think they can simply put any engine in any car in an afternoon. No clue about mating to the transmission, engine brackets, and the gazillion interfaces and interferences. Some kids even imagine they can just throw in an electric motor to get a BEV.
An LS engine is good for tuner parts and knowledge, but easier is a Magnum 5.2/5.9L to replace a small-block engine, but won't mate to an early transmission (pre-68?) without mods and using its OD transmission requires reforming the trans tunnel. That gives MPFI and crank-triggered ignition, but problems with heads cracking. I would wait for an easier solution. Someday, an e-motor drop-in with new super-light solid-state batteries in a small package, always just over the horizon.