Tear into it, or bolt in and go???

I have a dilemma, and I need advice on which way to go. I had a 1971 la318 in my 66 Dart, bone stock 2 bbl 318.i was going to do some upgrades, but I t was tired and I picked up a 1974 318 to drop in. The 74 already has been swapped to an edelbrock 4bbl intake and carb, so I was going to just paint it and go.

However, when pulling valve covers and intake to clean and paint the engine, I noticed it has 360 heads. So here’s my dilemma:

It’s March, and I want to be up and running soon. But with the 360 heads, I’m now wondering if it has been bored out, if the compression ratio issue has been addressed, if it has a can, etc. the guy I bought from didn’t know any history on it, just said it had a surprising amount of power for a 318, and compression was 180-185 across all 8 cyl.

So, do I accept that it runs well, paint it and go, or do I pull the heads and timing cover, and see what else has been done?