Brain fart question 914-6 Options

[mb911]

So I am helping a member put brakes on his 914-6 conversion and then put carbs on it. He previously has a poor working sniper setup. It ran ok prior according to him. Then they switched to a 123 dizzy and removed the MSD ignition and then took to a tuner prior to my part. It ran much worse once the 123/MSD removal. The owner decided he was done with his sniper setup and asked me to put carbs on. I did that and for the life of me we can’t get it to run right. Starts pretty easy and idles decent. When I go to throttle up by hand on the cross bar it doesn’t want to accept all the fuel and shoots quite a bit back up through the horns. My suspicion is a major timing issue as in 180 off. The carbs are new and setup up by Dave Chenny so very confident in them. Seeing as the car is 1.5 hours away each visit I am looking for a bit coaching here. What else should I be looking at? The engine is a fresh 2.7 not built by me with about 1000 miles on it.

Help with some ideas please.

[technicalninja]

What else should I be looking at? The engine is a fresh 2.7 not built by me with about 1000 miles on it.

Help with some ideas please.

Maybe valves too tight?
With consistent worsening run problems, I'd look to crap that can affect timing.
I don't think it would even start 180 out. The blowback via carbs leaders me to believe either intake timed wrong from the get-go or decreasing valve clearance as the valves seat. Don't 911s have super tight initial clearances? I thought they were .004".

I'd do a compression test and leak down if I didn't find tight valves.

Piss poor seating valves could do the same...

Do you trust the engine builder?

If not then anything could at fault. It is probably the reason the sniper sucked as well.