440 Engine Build w Timing issues

Hi,

I'm really puzzled with the timing issues I'm experiencing. This is my second 440 engine build. For a couple reasons, my first build ended up spinning a rod bearing. This next build I was exceptionally meticulous during the installation of main and rod bearings. I also used the spiral locks when I was not supposed to. I did ask several local experts and was told I did not have to degree in the cam since is was same cam, same crank, same hydraulic rolller lifters, etc. So I put the engine together same a previous build. I even went back into to timing cover to align the R with the dot on the timing sprockets to verify same timing. What I'm experiencing is that the car does not want to start unless its 50-60 degrees advanced on initial. I have checked the following:

Timing on crank and cam is as last build (I degreed in the cam 8 times since it was my first build and total timing last build was 36 degrees. Also, first build engine fired up and ran well)
Using borescope and setting the mark on balancer to timing cover at top dead center on compression stoker, my rotor is facing wiring 1 for spark on cylinder 1.
I have triple checked my wires and firing order
I set the lash on the valves using the same video as first build and even took off the cover to make sure valves arent held open
I have checked compression on cylinders
I have spark and fuel (also checked fuel pressure)
I have MSD distributor and ignition which I pulled apart to verify weights are not sticking

When the car is really advanced it will fire up but not run like it used to. I did have back firing out of the carb but I found the distributor gear needed to be re-positioned.

I have tried everything and if I have to tear into the timing cover again I will replace the timing set completely. I was hoping not to do that. I will likely need to degree in the cam again. Any suggestions on doing that while in the car?

Is there anything else I can try that won't require me to drain all the fluids and tear back into motor?

Please HELP!!!!