IMHO, either you "learn to turn" or you dig into those deep pockets and send it to one of those "three major" restorations houses..... With those stated miles, you need an engine. 'Cause any professional(?) using RTV on a fuel system, like as mentioned and can't diagnose 8 Cylinders that don't have compression is seriously lacking somewhere. Too many fundamentals that are being overlooked. Good Luck!