Changed intake gasket, now it won't start

Ohh to answer one of the last posts.
Engine was rebuilt 5 years ago. Was running fine when I bought it 2 months ago but it had a vacuum leak at the intake manifold.

Vacuum is 9 at 750 idle. 16 at 1500.

I checked cold compression prior to removing the intake. Ranged from 125 to 155 which I have been told is within tolerance.

I think I will check it again when warm.

Spark was checked by air and ground to the block. It's running now so I assume the spark is ok. I guess it could be weak but the spark is blue.