I went from a carbed 383 to a modified wet sump LS7 in my 69. I couldn't be happier with the swap, but it is expensive and not for the faint of heart. When making the swap to any LS powerplant you have to consider changing the motor mounts, wire harness, some gauges: if not all of them, fuel lines, gas tank, probably the transmission-with controller if auto, exhaust, drive shaft length, an ECU needs to be added.
You can do a carbed LS for less- but that defeats the purpose unless you just want an LS aluminum block. The aftermarket performance stuff for an LS is outstanding and always improving. I went from 335whp with my built 383 to well over 485whp with a NA LS7, and with a little help from Tyler at ATS- well over 500whp. By comparison on the same dyno a new LS7 Z06 with CA intake, LT headers and manual put down 440whp. Some builders are getting more than 700hp from a NA LS7, so the performance is comparable to BB. With that kind of performance, I don't think the LS powerplant will be outdated in the near future.
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