2009 pontiac g5 198000 miles. Car died going about 10mph in a parking lot I was told.
changed fuel pump and filter. Crank sensor. Intake and exhaust timing solenoids. Has fuel and spark. Took off timing cover chain was loose. Plastic guides were broke. Removed the head all of the intake valves left marks on the pistons no exhaust valves hit. didn't appear bent but I changed them anyways. Lapped and installed. Replaced both chains and all guides. New tensioner yes I engaged it. Timing marks are all lined up 11 2 and 5 o'clock #1 at TDC crank key way pointing up. Put cams in same position I took them off. Pistons didn't have any holes.
my compression reads: from front to back
115, 90, 50, 50. Are those results ok? I feel like they're not. I would be leaning towards a pcm if the compression was ok being that 2 weeks prior the car went in limp mode had to run a ground to the the pcm to fix the issue.
I'm so lost I've been working on this car for atleast 50 hours and keep dumping money in this car.
any help would really be appreciated. Thanks in advance.
I'm sure I forgot some details.

Cams at 7 and 11

Intake valves appear to have touched pistons

Marks in the carbon build up from valves i think

 

Pretty sure 140-150 PSI is normal for your 2.2 liter. 50 PSI is not normal.at all. Did you do a wet compression test? I doubt that such low values would make a difference. Blown or bad head gasket is high up there of suspicion, along with stuck/bad piston rings.or warped head