I got my distributor for free, I think you can pull a z1/z6 dizzy for 20 bucks (I almost bought one for that much and got lazy and didn't).
You can rewire your obd1 dizzy plugs, that's what I did.
I thought they were 190cc too, but my MID seems to disagree,
, who knows for sure, but they're def not 240cc.