Finding K20 Drivetrain

[bhayes1]

I’ve got a 72 K20sitting in the yard without a motor or trans. Came with a 350/350/205. Still have the 205 transfer case. I’d like to get it back on the road as cheap as possible. The 4x4 th350s seem a little hard to come by plus id still have to find a 350sbc. So my latest thought it is pick up a square body burb. Seems they can be had for 1500 or less and pull the guts out and put in my truck. Any thoughts on the np208 ( I don’t off-road much) and doing this swap? What specific years to look for... I know some of the later ones had overdrives and some had 400s Any other cheap alternatives would be considered... maybe I’m forgetting some options.