Kf:
Consider a minimalist approach for openers; a bit of time spent crawling before attempting sprinting can be useful.
The MS MicroSquirt serves well as a fuel only controller, and can be triggered from ignition for engine speed information.
The existing ignition system will be retained complete.
The existing idle air system will be retained. If the matter of possible fuel crossover in the idle air passages is thought to be a real concern (the condition exists with the CIS also) the passages can be blocked, and idle air introduced into the plenum.
The existing throttle body has a switch mounted on it which can be replaced with a TPS.
Once the CIS air flow meter/fuel distributor package is removed an air filter can be attached to the throttle body.