Re: Bottom D16Y7 non-Vtec with Top D16Y8 Vtec.
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Yes, that combo will work.
You would want to use an ECU that has vtec control because the PM6 doesn't do it.
OBD0 PR3's, OBD1 P28, or any OBD1 converted to support vtec (P04).
Best would probably be the P28 since the fuel maps are going to be pretty close right out of the box.
You will need to convert to OBD1 if you use an OBD1 ECU.