Engine No compression

Hey everyone I bought a roller a couple years ago and my mom had a rebuilt engine in her fox didnt drive it much. The engine is a 302 bored to a 306, tfs aluminum heads, B cam, Holley systemax intake, t5 tranny. She parked it one day and it just sat there. Recently her house insurance made her get rid of it, I couldn't get it ruining in the time I had so I pulled the engine and took it home. I slowly replaced all the gaskets and painted the block etc. I few months ago I tried to start the car and it turned on but wasnt ruining right. Pulled the heads and the valves were leaking pretty bad. Took them to a local shop and had the heads rebuilt. put everything back together and wont even try to turn on. I checked compression and had 0 lbs on both sides. I pulled everything off today and the spark plugs and valves on the heads look brand new. Like I didnt even crank the car. What would cause no compression? IM getting spark and fuel pressure. I have mostly everything off right now besides driver side head and timing cover.

General karthief said:

First thing that comes to me would be valve adjustment incorrect, valves adjusted to tight can hold the vales open - 0 compression

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Are you talking about when you rotate the crank and adjust each rocker? If so I’m pretty sure I adjusted them correctly. I just wait until the opposite rocker is about to go down and then finger tighten it but you can still spin the push rod by finger then lock it with a quarter of a turn.

Or are you referring to the heads being rebuilt?

I’ve done roller rockers before and I’ll re watch this video. A couple questions before I get started today on the car.
Would there be no compression if my timing chain isn’t alright correctly?
Is there a way to test compression with out putting the engine all the way back together? Can I throw the head on and adjust the rockers and test like that? With out putting all the accessories and manifold on?
Thanks in advance.