On a lighter note:
Here's a good question. On my 20RG (360 with Thermoquad), I am installing hitch and beefing up the frame extensions in order to flat-tow a 1988 Mitsubishi Montero (3100 lbs). We are moving in the spring... I was doing everything this winter to prepare for the cross-country trip, and my thoughts went to EFI. I found a self-learning aftermarket throttle body injection unit that replaces a 4-bbl and is good up to 400 hp. My Thermoquad always wants to run rich (I live at 4,000 feet now), but I don't want to re-jet it, only to have it too lean at sea level. This makes for poor fuel economy and difficult hot starting (need at least half pedal and a long crank to get enough air in to fire off).
Anyway, I get between 7-8 mpg now. I assume this will drop to 5-6 when flat-towing the Montero. I already had a custom exhaust put on to open up the flow (a single 2.25" pipe isn't enough for the 360 to breathe effectively, so its now 3"... but I haven't made any trips on the new exhaust to test out the potential fuel economy improvement). Is it reasonable to think that with the exhaust work and the fuel injection unit installed that I could break 10 mpg at 60 mph, and get 7-8 towing? My tires are already about 15% taller than factory, so the RPMs are a little lower going down the highway.
The plan:
Replace Thermoquad with EFI unit.
Add electric inline pump by tank for a more reliable fuel supply.
Replace coil with aftermarket, high output 12v unit.
Bypass ballast resistor.
Do basic maintenance before leaving: new bets and hoses again, new water pump.
The injection:
https://fitechefi.com/products/30003/
The pump:
https://www.holley.com/products/fuel_systems/fuel_pumps_regulators_and_filters/fuel_pumps/carbureted_fuel_pumps/carbureted_electric_fuel_pumps/parts/12-426
The Coil:
https://www.amazon.com/ACCEL-ACC-8140-Performance-SuperStock/dp/B00064P99W/ref=sr_1_10?s=automotive&ie=UTF8&qid=1544904461&sr=1-10&keywords=accel+super+coil
