I dont run alky so forgive me if any of my info is bad.
Wait,,,, first things first. Get your head cut properly, Not just shaved, there is a big difference. Especially since it needs to be recut anyways for the +4 crank. The spacer will work but if your going to do it "do it right" . get everything cut to spec and cut properly. Proper port timings aswell.
What is your compression at the moment?
Not sure if you have these tools or not but if you dont you should surely get them. A leakdown tester, and a decent compreasion tester ( i find the cheapest relible one to be a Craftsman compression tester).