Fuel injection conversion on a classic is one of those topics where everyone has an opinion and half of them are wrong. Here's what I've learned after doing it to three cars.

The Holley Sniper is the easiest entry point and it actually works well if you tune it properly and don't cut corners on the fuel system. The throttle body sits where the carb used to be, so engine bay aesthetics are preserved. Self-tuning works for most street builds.

For anything more serious — a performance build, a car with aggressive cam timing, a big-cube engine with high compression — go standalone EFI. Megasquirt or Holley HP. The up-front cost is higher but the tunability is in a different league.