7400 shouldn't be undoable, considering it's probably got reasonably fresh (and maybe heavier-duty) valve springs.
I'd guess you're right about the ignition, too.
I'd also guess your throttle response will calm down once the exhaust is done; I'm sure the 'puter doesn't have the slightest idea what to think, just now.
You/he might look into the possibility of some reprogramming as well - the Camaro was quite a bit heavier than the Mazda, which would probably like more advance and a quicker curve.
The lower-end should be up to flashing it, but with all the cubes, it's certainly not necessary.
I really like the looks of that little rig.
I'd better go on a serious diet...
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