Yo,
What displacement are you planning to run?
What compression?
What cam timing and intended power band?
What application? Fast road, khana, rally, hillclimb, circuit? <--- tick all that apply
if you're running <1800cc and <7000rpm i would be hesitant to open up the ports and bowls too much
you don't want to compromise intake charge velocity, fuel dropout and poor VE (lousy cylinder filling) can result amongst other things
you definately won't need to worry about meat in the head around the ports and bowls for your app on 3T-C head unless you're trying to take heaps out for:
> very high rpm
OR
> serious forced induction
OR
> serious displacement increase
OR
> combination of the above
hope this helps
as for running injection, i'd be getting a redline dual DCOE manifold, efihardware.com or injection perfection throttle bodies/fuel rail kit, and going that way for fuel injection on your project
all off the shelf, bolt up and someone to go back to if it winds up smegged. going custom yourself means your dick in your hand if something goes wrong and can be more expensive than just buying the right stuff in the first place.