69 chevy 250 head replacement

[Novicecarguy]

So I have just recently replaced my 1969 head. The cost to fix the old head was substantially more than just buying a new head. my new head I got is a 1970-72. Now I’m wondering if they’re even compatible. My motor is now running a lot hotter than it was before I also put in a 180° thermostat. My carburetor was just rebuilt by the old carb doctor in North Carolina. My problem arises once truck is up to temperature and I am sitting at a stop sign and go to hit the throttle it sputters in spits out Blacksmoke. I got Jeff from the old card doctor on the phone and he is saying that everything is too hot it is vaporizing everything so that’s got me wondering if the 69 block is compatible with a 70s head has anybody else run into this problem any comments would be greatly appreciated.
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