Hey I need to know how to clean fuel injectors and rails by hand off the car,whats best process ,just got my 86,c4,stock L98 runs good but has over 100k.also will a porting of the throttle body/tubes/intake give me approx how much more extra hp ?
As far as anything that you can accomplish through porting the various intake components, ported runners may provide some benefit, but turbulent flow in the plenum and around the throttle body isn't causing any problem.
When you've improved the flow capability of the heads, installed a better camshaft, and eliminated the restrictive L98 exhaust system, then you might get some measureable benefit from porting the runners.
Give your car a solid tune, run a baseline dyno, and then start the mods. THEN you'll know what worked (and perhaps as importantly, what DIDN'T!).