Would be planning to run an Isuzu 4JB1 N/A (around 80hp and 130lb/ft torque) with turbo low-boost system (just to shove air in and keep smoke and EGT down)
The Isuzu 4JB1 I'll be using is a early truck type unit (no oil cooler, 4-hole injector with square bowl piston), would not run a turbo I/P as stock N/A power level would be sufficient but needed to be efficient at 1,400-3,500rpm with my cruising RPM range from 1,500-2,600rpm at 30-60mph.
Would also need to assess whenever I need intercooling and if the vehicle needs to be regeared when necessary.
My vehicle would be an '89 Toyota Crown, with 3.91 rears, W55 tranny, 205/55R16 tires and grossing at 3,000lbs estimate.
I owned an early-80's Toyota with the 2.2 NA Diesel; and a 220D Mercedes. Both those motors made up for not having any power, by not having any torque.The experience left me without any fondness of under-powered vehicles.
That Crown seems the perfect place to drop a VW TDI. But, I know that's not what you're asking.
What did your motor come out of? What transmission and gearing?