Identification, 5.0 & 5.8
To determine which EFI V-8 engine you have, look closely at the EGR Tube;
The 5.0L EGR Tube runs from the lower intake manifold to bottom of EGR Valve
The 5.8L EGR Tube runs from the passenger exhaust manifold to bottom of EGR Valve
Identification, 5.0 & 5.8; "...quick ID tip: The lower thermostat housing bolt on the 302 will be below the top of the water pump and you won't be able to put a socket on it. On the 351W you can remove the bolt with a socket.
The positive ID is to measure the lower intake; 302 is aprox ~ 8 inches wide. 351 is aporx ~ 11 inches wide.
The 5.0L uses squared ports and the 5.8L uses oval ports. If you get an intake from a junk yard it will have the matching fuel rail..." Read More
Source: by fordification.com & Ryan M (Fireguy50) via miesk5 at Ford Bronco Zone Forum
Windsor/Cleveland engines. "...The most obvious external difference is the engine valve covers. The 351W (Windsor) valve covers are attached with 6 bolts, straight front to rear, and narrow in width (similar to the 302 c.i. engine.)* The 351C (Cleveland) valve covers are attached with 8 bolts, flat with 2 different planes, and wider in width. The 351W engine has a radiator hose that attaches to the intake manifold, while the 351C attaches to the engine block. (See Graphic 1 on next page). The 351W takes a 5/8” thread spark plug and the 351C takes a 14mm thread plug. (See Graphic 2 on next page). Distributor differences: The 351W has a smaller 1.245” diameter distributor gear, and the 351C has a larger 1.418” diameter distributor gear. Each engine has a 5/16” oil drive at the bottom of the shaft and a 1.557” diameter housing, measuring directly above or below the O-ring area. *The Ford 302 c.i. engine has a ¼” oil drive on the shaft, a small 1.245” diameter gear, and a smaller 1.550” diameter housing. Windsor 351 V-8 Engine: 1. Valve cover is held in place by 6 bolts. 2. Radiator hose connects to water neck on.." The 351 Cleveland's radiator hose attaches to the radiator and connects directly into the front of the engine block. It makes a 90° bend from the radiator to the engine block.Cleveland 351 V-8 Engine:1. Valve cover is held in place by 8 bolts. 2. Radiator hose is a 90° hose that connects directly to the top front of the engine block..." see diagrams
Source: by CARDONE® http://my.cardone.com/techdocs/PT%2030-0006.pdf