Underpowered 300SD

[revray]

1980 300SD - Had biofuel problems. Car had hard starting, wouldn't idle on it's own, no power. Did Diesel Purge. No improvement. So I've...

1. Put in rebuilt injectors...all five.
2. Put in a rebuilt injector pump.
3. Put in all new fuel lines all the way back to the tank.
4. Removed tank, had it cleaned at the radiator shop, and reinstalled.

The car now starts up the first time. Idles perfectly smooth. But not much response when I mash the accelerator down. It crawls, and I mean crawls, for a while, especially uphill. After maybe 10 to 15 seconds, the transmission appears to engage properly, and the car then takes off and runs generally like it supposed to.

Any ideas about what to do about my no-power-at-the-start-and-going-uphill problems?

Thanks,