my little sammy has a weber, its okay but not good enough. i'd like my car to keep running down hill, or when i hit the brakes hard, and in the winter, and to pass emitions easier.  the problem is i have this hot (as in spark) msd set up i don't want ot get rid of. can I keep it when i swap in the fi computer??? thanks

Possibly, if you piggy back the ignition input to the ECU input you might get impedance matching problems. No harm in giving it a try though.