I am wanting some input on Spark plug brands, and Plug wire sizes.

The engine is the 89 3.1 in my race car. Factory size wires are 7mm, I am curious if an 8mm wire would be better for my app. I have been running the Bosch platinum plugs, but have read a few bad things about them as of late, what brand plugs do you guys like? Thanks in advance for the input.