[TurboKraft]

That looks like a decent solution for the non-turbo MFI engine, but not for the 930.
And it requires 964 fuel rails -- very expensive new from dealerships, but fortunately there are many leftovers from the engines Singer uses as cores.
(But many of those are now requiring re-finishing because of corrosion, and they have metric fittings, so there's those additional expenses.)

Roland is 100% on point: the stock injector blocks cracked in normal use, and don't improve as you extract more power from the engine.

Additionally, the injector angle -- which wasn't a problem for CIS injectors that spray a gas "cloud" -- is hardly ideal for an EFI injector that sprays in a 15-35deg cone.

Which is just one of the (many) issues with the GSF injector blocks: low speed driveability is compromised when a good porting of that injector spray cone is aimed at the port wall.

The PWR blocks were made by MODE and are discontinued. They were nicely made, other than the insulators that were prone to warping and leaking. This shortcoming is the reason we designed our insulators to interlock with the EFI injector block so they could not develop a leak.

In the scheme of the total EFI conversion, the cost of our thoughtfully engineered and well made EFI Injector Blocks package part is a very small expense.