Perhaps one might look in 'junkier' parts of town where abd. vehicles occur. Older, smaller towns that don't have enough volume to justify frequent trips to recycler might be another place to look. Commercial shops(electricians, hvac, plumbers, etc.) might have dead vehicles out back, broken down vehicles 'other side of tracks.'

Ed

'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.