Can anyone figure this out

OK from the beginning. I bought a 67 barracuda original 273 car now has a 360 with supposed 10:1 compression and the Mopar perf. 509 lift hydraulic cam performer intake and holley 3310 750 carb.. The engine I'm told is fresh and it appears to be. I had the car running decent but I wanted to upgrade the distributor which is a single point I believe to be from the 273 engine. I bought a proform electronic conversion kit from Summit. I installed it and the car would not run. I swapped out the ECU with one from one of my other cars and it still wouldn't run. I sent the kit back and exchanged it for a rebuilt points distributor. The car would run with the new points distributor but would not idle. The idle would go from 1500 RPM to nothing and just stall. I bought a Petronix ignitor and installed it in this rebuilt distributor but had the same problem. The car will not idle correctly. I tore this distributor apart and even though it was rebuilt the advance springs were stretched so I replaced them but it did not help. Today I took the entire electronic ignition off my 73 340 Cuda and installed it on the 67. It is a mopar kit with the orange box and I used an extra 4 pin harness I had in stock and wired it correctly.I also used the coil from the 73 Cuda. The car ran but still would not idle. If I crank the idle up to about 2000rpm it will run but lower than that it just stalls. I put on a different carb and there was no change. The engine has low vacuum at idle (I assume from the cam) so I tried a 3.5 power valve, a 2.5 power valve and even a block off plug none of which helped. I did a compression check and a leak down test and all was good but the car would not idle. If I get it to idle for a minute as soon as I rev it the idle either stays high or comes down too low. I started thinking maybe the camshaft is installed incorrectly or something else internal was drastically wrong.. As a last resort I stuck the original points distributor (which now has the new points and condensor from the rebuilt distributor that were removed to install the ignitor) back in the car and it idles fine. Does anyone have a clue why no other distibutor will work in this car?