Willing to bet that the timing is too far to an extreme of advanced or decreased. You’ve been working on this for a while now. Have you access to a timing gun? I was trying to set my timing the other day and took it to an extreme and the engine started like normal, but it lacked all power, die often in idle while in drive and the engine got mighty hot.
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Plan your work and work your plan!!!, or pitty da fool!! 
87 GMC BaseTrim, 305 under the wrench/TH400/
92 Chevy 1500, 350,TH700R4 sittin on dubs
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