Thanks in advance for the help...because I have searched for days and days with no answer

I will try to keep this short but with all of the adequate information helpful for diagnosis.

I blew head gasket and cracked the head on the freeway.

Replaced head with rebuilt 123 Head, I used the W115 pre-chambers and Injectors and cam from the old head and installed onto the new 123 head.

Motor ran great before. It's a highly maintained car. I bought it from original owners.

Just fired it up and it idles way high, about 2500...so I guess it isn't really an idle is it??

Thoroughly bled the fuel and cooling systems.

All vac lines perfect and no leaks detected.

All throttle linkage is free moving and where it was before.

Idle screw will not lower idle.

When we were pulling the timing chain under the head when we swapped the head, the chain dropped out of our hands and onto itself. Not too sure if slack was created below, but this happened twice.

When putting the cam gear back on, all marks I painted on the gear and chain went back together and lined up perfectly as well as lines on cam tower. So no tooth was skipped on the crank for sure.

Nothing will get this to idle except for this...when I unhook the rod going from injection pump to throttle pivot arm bolted to the valve cover, and pull it up about an inch or so, the idle gets pretty good. A little up and down either way will change it and there is a definite sweet spot with smooth idle about 800 and no nailing.

Question posed: Could I have lost IP timing when the chain fell? Is pulling this rod mimicking changing the IP timing?

What are my fuel timing numbers on this motor, (i,e. fuel seeping out of line 1 at 15 deg. BTDC).

Thanks, and please help where you can. I am not keen on paying the dealership to finish this thing. Thanks!!! (so much for keeping it short)