All I had to do is put in a converter in tranny.
The truck will not get out of it's own way. It will pull like no other. Love it.
Nice! I love that 300 inline six. All during the eighties my dad had a '78 pickup with that motor, but it was an automatic and seemed to be set up for economy, so maybe the gearing was a lot higher than yours. It cruised nicely at 60 all day long, seemed like it got in the high teens mpg if I remember rightly.
Later on we had some workmen's vans with the 300 six and five speed manual transmissions - now those were great little vehicles - quite economical, and lasted forever. I think we got at least 200K out of each of those before we let them go.