I drive a 5800 ft summit fairly regularly with a '67 GS 400. I have no problems, so I would have to say no
I plan on swapping in a 455 this spring, I will let you know if it makes a difference...
I would suggest that rather than investing in an efi, you could take it to a good tuner with a chassis dyno and let him play with it for a day or what ever he needs. It will probably be a better investment than an efi even though it may drill a big hole in a thousand bucks.
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