Well, not too many big power guys out there! hah.
Cams shouldn't be hard to find, they are common with the 1.6L Miata
Squirter delete? That's big for piston cooling
With larger injectors you're going to want to go with an aftermarket ECU - some options today. Megasquirt, Speeduino, RUSefi, maybe others. Can control spark as well then.
The Festiva guys have a few guys running some hot B6T's but the best bang for buck is the BP 1.8L swap, some more aftermarket options for that engine, and more big power guys with them. A few Facebook groups exist for the Mazda guys, none specifically for hot BPs that I can think of. Keep in mind G-type transmission is a power bottleneck (even with LSD), the popular thing to do is get an adapter plate for a Toyota e153 transmission and adapt that to work, been done a few times in a BF chassis but never a Capri