repair/service manual
even though mine is not a slant 6??
None of the manuals posted are specific to a /6. The factory manual covers ALL available engines for all bodies which the manual covers, I.E. pretty much all passenger cars. Truck manuals are a different manual
I haven't read the other two -- Petersons troubleshooting, etc, but if you are not experienced in general mechanics and electrical, it is probably a good deal.
I am, frankly, AMAZED by the questions on here where guys don't have the slightest idea --no electical diagram, no service book, no nothing. Yet they are working on something that MATTERS and that they often have a ton of money into.