Sounds like an interesting project.

You are set on using the B16A block? I believe the B16A is actually a smaller block (in terms of deck height) than the 1.8L's (except the B16B Civic Type R motor which is a destroked B18C5) so I believe that means you are stuck with the B16A crank. I haven't done the measurements myself but that's what I understand from the internet scuttlebutt.

Why are deadset against LS/VTEC, especially if your planning to stay N/A? I think putting that GS-R head on one of your B18A blocks, stuffing it with something will land you around 11 - 11.5 : 1 compression (OE if it's cheap enough, aftermarket if not or you really plan to stuff nitrous down it's throat)and find yourself a first gen B16A cable tranny for the gearing and off you go.

There are pre-OBD B16A ECU's out there but I think it's $125 for a conversion harness to plug an OBD I ECU into the thing and that will give you a lot more tuning options.

If your sticking with the B16A block, I'd sell the rest and find a B16A head and bolt the thing together. Spend what you can on cams and hope for the best. I think you'll be a lot better off using the B18A bottom end with the B18C1 head with OBD I tuning options.