I know what you mean about the old truck thing. BTW I'm not as old as the other two, but still 4 years older than your '72 truck. My truck is however 9 years newer than yours LOL! This sounds like those word problems in algebra class. Ask all the questions you like! Have a good one.
Jeff
2006 Superior Blue Trailblazer SS AWD, Stock as a rock
Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).
Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning