this weekend im going to look at a 83 or 84 k20 with a 6.2. it was run out of fuel, then parked from what i was told. id like to try and get it running so i can drive it home instead of trailer it, but im taking a trailer in case. how do i bleed the system to get it started? also it has sit for about 2 years, anything that i should check that is specific to the diesels? ive searched, but can't find anything usefull.