First off I'm sorry for asking a bunch of questions on this car I just want it fixed so I can get rid of it.

Before the intake it was running funny, hesitating on take off and hesitating on accel, I tore it down after it started leaking coolant from the crossover.

After I replaced the intake and plugs/wires the car started funny and was noisy on startup, the valve train started making more noise then before and my power loss/ hesitation became worse

Basically my question is...
Could this be an out of place Pushrod?
Could I even drive 5k if I did misplaced a Pushrod?
Lifter issue?
Or a clogged cat?

I ask this bc all I have tested so far came out good except manifold vacuum
Compression 200 -/+ 5 all 6
Fuel pressure 58 to about 60 on accel
Spark strong
Fuel Injectors all working
Air filter new
Maf/map good
Coolant/iat good
Throttle clean
Plugs(ac delco .040)

Only thing standing out is vacuum fluctuates 2-4 at idle but OS pretty steady at 19

Any ones knowledge on this homogulation of the 3.4 please help me out, I'm stuck between a rock and a hard place I would tare into it again but I want to be 110% sure of what I need to fix

Thanks again