Detonation on a BBC

[IRONCLAD]

Does anyone out there know anything about an Automotive Performance Inc. MK-II Vapor Injection (water injector)....like what years they were used for and if they are compatible with a 1969 BBC, with closed chamber, rectangular ports? I know this is a long shot but hope someone knows!

I don't want to put oval heads and bring the CR down to a ridiculous ratio of 8-1 with a great engine like the L-72. However, I want to able to drive it around town if I want to.
Some people say to double the head gaskets, some people say to use TRW "Turbo" pistons, stellite valve seats and bronze valve guides and still others say, use water injection.
I cannot get Sunoco High Octane in the South here nor have I got connections to Aviation fuel. And I don't know if an Octane Booster down the local NAPA store will actually help.
Any recommendations? Thanks.

(Gee, It's hard to write all these upper and lower case letters all the time - hope it makes the "Administrator" happy)