Im sure some of this info has been posted before but here it is again..
The 351windsors deck height is more than 25mm taller than a 302w
You can really notice it when looking at the two engines .
Look at the intake manifold to block gasket surface just behind the distributor if its a 302 its about 4mm higher than the machined surface the distributor holding bracket bolts to, on a 351w its alot higher (around 20mm) .
Heres some casting No.s..
If it has these on the block its a 351w from 1978 or earlier
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