Re: CIS pistons and stock cams with webers.
I've found the combination to work well for the time being. At some point I may go back in their and swap the pistons and cams for something more exciting. All a function of cash flow
Gas mileage stinks, but throttle response is great.
Re: distributor. Another option to consider might be the HPX ignition system. Can do fine tuning with the HPX.
Re: fuel pump. I used the MFI electric pump with the regulator, but the MFI doesn't generate the fuel pressure that a CIS does! Do a search for carb fuel pump there are many options. The 70 or 71 fuel pump for the 911T looked like it would be an easy solution, but my memory is fading. Also suppose it depends on if you are going to use the return line to the tank.