Can you really expect to run 10.5:1 on single plugs without sending your motor to the grave early? BTW, SINCE YOU'RE IN THERE and replacing pistons and using carbs, you need bigger cams. DC44s come come to mind...
Yeah, I understand the "while you are in there" syndrome. I was going to
simply reinstall the MFI on my early car. After some inspection, we realized the car's heads were not original (no MFI spigots) and the cams didn't have MFI drive.
So, I bought NOS '69S heads and John Dougherty cams (much hotter than stock) to make up for those issues. But
since I'm in there I am now heading toward a complete rebuild (even though the motor is strong) to install my GT3 oil pump; but since the case will be open, why not install Pauter rods, have a full balance done, install oil squirters and shuffle pins, add a high end valve train, rebore the MFI stack and do a twin plug conversion so I can add 906 pistons?
How the HELL did that happen? 