BTW Econodynes SUCKED! Had to add gears to get them to work well.
Can still remember that Old Man's B series, had a Maxidyne in it(Transplant), odd pull cable on the dash with a 1" flat Washer on edge for a pull. Was getting readout from running valves new nozzles and a little intake repairs for that previous mod, BTW Straight Stack Exhaust NO Muffler just a rain rattle. On the Dyno SAME Dyno, was pulling HP of 270+/- at 1800, curious George got the better of me, and I pulled a little, not much resistance, pulled a LITTLE Harder and ROAR!! Dyno gauge went over 350 WELL OVER, foreskin was walking the lot JUST HAPPENED to see it go off, came a running. Said Fireball out the Stack was really impressive, then we heard the crackling and he had me get the truck the F outa there. Takes time but I got it out so the STL FD could get in.
Old man had a Custom Shop Stinger on the rack or governor, SOMETHING, Some rather inconspicuous pump work where COULD go a little MORE fuel than allowable. I set fire to the Dyno exhaust hood where some thirty plus years of oil and carbon had built up really well. That took almost an hour to recover from. He explained was a little hard pulling assist he and another guy had figured out, truck left the shop NO WARRANTY.