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I would start with the carburetor, checking the floats! Check fuel pressure! Recheck timing! Mopars are finicky and after making one adjustment you usually have to recheck everything! Had this same problem with my 68 GTX!
If that’s a center force clutch it should not be like that although I believe they require you to remove the must’ve spring under the dashboard! I had one of these in front of my rock crusher, didn’t remove the spring and it still was easy! I got rid of mine and installed a dual disk because...
Your oil pressure is too low! It should be between 40 and 45 psi no matter what oil you use! I personally use the 20/50 Castrol in my 440 that was built in 98 and runs as strong today as the day it was built! Sounds like you have a weak spring in the oil pump
Most 4 speeds have 2 shifter positions! The right bell hosing and clutch/ throw out bearing and you’ll be fine! Mother MOPAR put 23 splines in cars with automatic transmission and 440 and 18 spline in 4 speed cars with the 440 and hemi